RESEARCH

Papers

2025
  • Rocksalt-type heavy rare earth monoxides TbO, DyO, and ErO exhibiting metallic electronic states and ferromagnetism
    Satoshi Sasaki, Daichi Oka, Daisuke Shiga, Ryunosuke Takahashi, Suguru Nakata, Koichi Harata, Yuichi Yamasaki, Miho Kitamura, Hironori Nakao, Hiroki Wadati, Hiroshi Kumigashira and Tomoteru Fukumura
    Dalton Trans. 54, 1521-1527 (2025).
    [DOI: 10.1039/D4DT03214D]
  • Thin film epitaxy of high quality ferromagnetic semiconductor EuO using pulsed laser deposition equipped with Nd:YAG laser
    Ramchandra Sahoo, Yusuke Sato, Satoshi Sasaki, Masamichi Negishi, Ryota Takahashi, and Tomoteru Fukumura
    Chemistry Letters 54, 2, upaf005 (2025).
    [DOI: 10.1093/chemle/upaf005]
  • Selective heteroepitaxial synthesis of 2D bismuth-based mixed-anion compounds with interfacial spin-orbit interaction via atmospheric solution routes
    Zhengkang Peng, Daichi Oka, Yasushi Hirose, and Tomoteru Fukumura
    J. Mater. Chem. C 13, 7052-7058 (2025).
    [DOI: 10.1039/D4TC05433D]
  • Thickness-induced metal-semiconductor transition in LaH2 epitaxial thin films grown by reactive rf magnetron sputtering
    Sumireno Uramoto, Hideyuki Kawasoko, Satoru Miyazaki, and Tomoteru Fukumura
    RSC Appl. Interfaces, 2, 822-826 (2025).
    [DOI: 10.1039/D4LF00367E]
  • Millimeter-Sized Single-Crystalline Anatase Nb-Doped TiO2 Membranes Exhibiting High Electrical Conduction and Transparency
    Yuzuki Uchida, Jiyang Huang, Masamichi Negishi, Seung Sae Hong, and Tomoteru Fukumura
    ACS Appl. Electron. Mater. 7, 8, 3308-3313 (2025).
    [DOI: 10.1021/acsaelm.4c02342]
2024
  • Semimetallic electrical properties of rock salt-type LaBi thin films grown by solid-phase reaction of La/Bi multilayer precursors
    Kenshin Yoshikawa, Hideyuki Kawasoko, and Tomoteru Fukumura
    CrystEngComm 26, 2940-2944 (2024).
    [DOI: 10.1039/D4CE00198B]
  • Enhanced Curie temperature near 300 K in highly crystalline GdO epitaxial thin films concomitant with an anomalous Hall effect
    Takato Fukasawa, Dai Kutsuzawa, Daichi Oka, Kenichi Kaminaga, Daichi Saito, Hirokazu Shimizu, Hiroshi Naganuma, and Tomoteru Fukumura
    J. Mater. Chem. C 12, 7652-7657 (2024).
    [DOI: 10.1039/D4TC00738]
  • Photoreflectance spectroscopy of BiOCl epitaxial thin films
    Tomohiro Nishiwaki, Zaichun Sun, Daichi Oka, Tomoteru Fukumura, and Takayuki Makino
    Jpn. J. Appl. Phys. 63, 02SP09-1-5 (2024).
    [DOI: 10.35848/1347-4065/ad0306]
2023
  • Multilayer Solid-Phase Epitaxy of La2O2Bi Thin Film toward Higher Electrical Conduction in Monoatomic Bi Square Net Semimetal
    Yuki Yamamoto, Hideyuki Kawasoko, and Tomoteru Fukumura
    ACS Appl. Nano Mater. 6, 20673?20677 (2023).
    [DOI: 10.1021/acsanm.3c03344]
  • Thickness-dependent magnetotransport properties of rocksalt NdO epitaxial thin films: observation of a ferromagnetic phase far above the Curie temperature
    Daichi Saito, Daichi Oka, Kenichi Kaminaga, Miho Kitamura, Daisuke Shiga, Hiroshi Kumigashira and Tomoteru Fukumura
    J. Mater. Chem. C 11, 12400-12405 (2023).
    [DOI: 10.1039/D3TC02478D]
  • Thermally reentrant crystalline phase change in perovskite-derivative nickelate enabling reversible switching of room-temperature electrical resistivity
    Kota Matsumoto, Hideyuki Kawasoko, Eiji Nishibori, and Tomoteru Fukumura
    Adv. Sci. 10, 23049 (2023).
    [DOI: 10.1002/advs.202304978]
  • Slow Magnetic Relaxation in a Ferromagnetic CuII Chain Complex, Induced by Phonon Bottleneck Effect
    Sailaja S Sunkari, Abhineet Verma, Om Pandey, Shraddha Gupta, Masanori Wakizaka, Shinya Takaishi, Hideyuki Kawasoko, Tomoteru Fukumura, and Masahiro Yamashita
    Dalton Trans. 52, 12604-12607 (2023).
    [DOI: 10.1039/D3DT02244G]
  • A transparent room-temperature ferromagnetic semiconductor on glass: anatase Co-doped TiO2 oriented thin films with improved electrical conduction
    Jiyang Huang, Daichi Oka, Yasushi Hirose, Masamichi Negishi, and Tomoteru Fukumura
    CrystEngComm 25, 4907-4913 (2023).
    [DOI: 10.1039/D3CE00364G]
  • Near-Ultraviolet Light-Driven Photocathodic Activity for (001)-Oriented BiOCl Thin Films Synthesized by Mist Chemical Vapor Deposition
    Zaichun Sun, Shaoyong Qin, Daichi Oka, Huijuan Zhang, Tomoteru Fukumura, Yuji Matsumoto, and Bingchu Mei
    Inorg. Chem. 62, 8914?8922 (2023).
    [DOI: 10.1021/acs.inorgchem.3c00466]
  • Rock-salt type LaSb epitaxial thin film grown by multilayer solid-phase epitaxy at high temperature close to 1000 °C
    Noriyuki Ishigane, Hideyuki Kawasoko, Yuki Yamamoto and Tomoteru Fukumura
    Chem. Lett. 52, 263-266 (2023).
    [DOI: 10.1246/cl.230020]
  • Charge order with unusual star-of-David lattice in monolayer NbTe2
    Taiki Taguchi, Katsuaki Sugawara, Hirofumi Oka, Tappei Kawakami, Yasuaki Saruta, Takemi Kato, Kosuke Nakayama, Seigo Souma, Takashi Takahashi, Tomoteru Fukumura, and Takafumi Sato
    Phys. Rev. B 107, L041105 (2023).
    [DOI: 10.1103/PhysRevB.107.L041105]
2022
  • A high-Tc heavy rare earth monoxide semiconductor TbO with a more than half-filled 4f orbital
    Satoshi Sasaki, Daichi Oka, Kenichi Kaminaga, Daichi Saito, Taku Yamamoto, Nobuto Abe, Hirokazu Shimizu, and Tomoteru Fukumura
    Dalton Trans. 51, 16648-16652 (2022).
    [DOI: 10.1039/D2DT02710K]
  • Rocksalt CeO epitaxial thin film as a heavy-fermion system transiting from p-type metal to partially compensated n-type metal by 4f delocalization
    Nobuto Abe, Daichi Oka, Kenichi Kaminaga, Daisuke Shiga, Daichi Saito, Taku Yamamoto, Noriaki Kimura, Hiroshi Kumigashira, and Tomoteru Fukumura
    Phys. Rev. B 106, 125106 (2022).
    [DOI: 10.1103/PhysRevB.106.125106]
  • Superconductivity and Improved Electrical Conduction in Anti-ThCr2Si2-type RE2O2Sb and RE2O2Bi with Pnictogen Square Net
    Hideyuki Kawasoko and Tomoteru Fukumura
    iScience 25, 104742 (2022).
    [DOI: 10.1016/j.isci.2022.104742]
  • Rock salt-type HoO epitaxial thin film as a heavy rare-earth monoxide ferromagnetic semiconductor with a Curie temperature above 130?K
    Tahta Amrillah, Daichi Oka, Hirokazu Shimizu, Satoshi Sasaki, Daichi Saito, Kenichi Kaminaga, and Tomoteru Fukumura
    Appl. Phys. Lett. 120, 082403 (2022).
    [DOI: 10.1063/5.0081040]
  • Temperature-dependent optical properties of ε-Ga2O3 thin films
    Takayuki Makino, Subaru Yusa, Daichi Oka, and Tomoteru Fukumura
    Jpn. J. Appl. Phys. 61, SB1031 (2022).
    [DOI: 10.35848/1347-4065/ac2215]
  • Rocksalt-type PrO epitaxial thin film as a weak ferromagnetic Kondo lattice
    Hirokazu Shimizu, Daichi Oka, Kenichi Kaminaga, Daichi Saito, Taku Yamamoto, Nobuto Abe, Noriaki Kimura, Daisuke Shiga, Hiroshi Kumigashira, and Tomoteru Fukumura
    Phys. Rev. B 105, 014442 (2022).
    [DOI: 10.1103/PhysRevB.105.014442]
  • Heterospin frustration in a metal-fullerene-bonded semiconductive antiferromagnet
    Yongbing Shen, Mengxing Cui, Shinya Takaishi, Hideyuki Kawasoko, Kunihisa Sugimoto, Takao Tsumuraya, Akihiro Otsuka, Eunsang Kwon, Takefumi Yoshida, Norihisa Hoshino, Kazuhiko Kawachi, Yasuhiko Kasama, Tomoyuki Akutagawa, Tomoteru Fukumura, and Masahiro Yamashita
    Nature Commun. 13, 495 (2022).
    [DOI: 10.1038/s41467-022-28134-w]
  • Versatile control of superconducting transition temperature in anti-ThCr2Si2-type Y2O2Bi via H, Li, or F doping
    Kyohei Terakado, Hideyuki Kawasoko, and Tomoteru Fukumura
    Dalton Trans. 51, 847-851 (2022).
    [DOI: 10.1039/D1DT04023E]
2021
  • Electron localization induced by intrinsic anion disorder in a transition metal oxynitride
    Daichi Oka, Yasushi Hirose, Shoichiro Nakao, Tomoteru Fukumura, and Tetsuya Hasegawa
    Commun. Phys. 4, 269 (2021).
    [DOI: 10.1038/s42005-021-00777-z]
  • Low-temperature topotactic oxidation using the solid-state oxidant Zr-doped CeO2
    Masanagi Abe, Hideyuki Kawasoko, and Tomoteru Fukumura
    Chem. Comm. 57, 11326-11329 (2021).
    [DOI: 10.1039/D0CC03431B]
  • Robust charge-density wave strengthened by electron correlations in monolayer 1T-TaSe2 and 1T-NbSe2
    Yuki Nakata, Katsuaki Sugawara, Ashish Chainani, Hirofumi Oka,Changhua Bao, Shaohua Zhou, Pei-Yu Chuang, Cheng-Maw Cheng, Tappei Kawakami, Yasuaki Saruta, Tomoteru Fukumura, Shuyun Zhou, Takashi Takahashi, and Takafumi Sato
    Nature Commun. 12, 5873 (2021).
    [DOI: 10.1038/s41467-021-26105-1]
  • Large magnetoresistance of a compensated metal Cu2Sb correlated with its Fermi surface topology
    Mizuki Endo, Hideyuki Kawasoko, Seigo Soma, Kunihiko Yamauchi, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Noriaki Kimura, Tamio Oguchi, Takafumi Sato, and Tomoteru Fukumura
    Phys. Rev. Mater. 5, 105002 (2021).
    [DOI: 10.1103/PhysRevMaterials.5.105002]
  • Systematic Application of Extremely Large Strain to Rutile-Type RuO2(100) Epitaxial Thin Films on Substrates with Large Lattice Mismatches
    Zainab Fatima, Daichi Oka, and Tomoteru Fukumura
    Cryst. Growth Des. 21, 4083-4089 (2021).
    [DOI: 10.1021/acs.cgd.1c00377]
  • Single molecular adsorption of terbium(III) bis-phthalocyaninato (TbPc2) governed by two surface reconstructions of perovskite type SrVO3 epitaxial ultrathin film
    Hirofumi Oka, Keiichi Katoh, Yoshinori Okada, Daichi Oka, Taro Hitosugi, Masahiro Yamashita, and Tomoteru Fukumura
    Chem. Lett. 50, 1489-1492 (2021).
    [DOI: 10.1246/cl.210270]
  • High electrical conduction of Sb square net in anti-ThCr2Si2-type La2O2Sb thin film grown by multilayer solid-phase epitaxy
    Yuki Yamamoto, Hideyuki Kawasoko, Tomoteru Fukumura
    J. Mater. Chem. C 9, 6880-6884 (2021).
    [DOI: 10.1039/D1TC00747E]
  • Increased hole mobility in anti-ThCr2Si2-type La2O2Bi co-sintered with alkaline earth metal oxides for oxygen intercalation and hole carrier doping
    Kota Matsumoto, Hideyuki Kawasoko, Noriaki Kimura, Tomoteru Fukumura
    Dalton Trans. 50, 6637-6641 (2021).
    [DOI: 10.1039/D0DT04288A]
  • B-Site Stoichiometry Control of the Magnetotransport Properties of Epitaxial Sr2FeMoO6 Thin Film
    Nand Kumar, Raveena Gupta, Ripudaman Kaur, Daichi Oka, Sonali Kakkar, Sanjeev Kumar, Surendra Singh, Tomoteru Fukumura, Chandan Bera, and Suvankar Chakraverty
    ACS Appl. Electron. Mater. 3, 597?604 (2021).
    [DOI: 10.1021/acsaelm.0c00933]
  • Synthesis of Stoichiometric SrTiO3 and Its Carrier Doping from Air-Stable Bimetallic Complexes
    Ebube E. Oyeka, Daichi Oka, Eunsang Kwon, and Tomoteru Fukumura
    Inorg. Chem. 60, 1277-1283 (2021).
    [DOI: 10.1021/acs.inorgchem.0c03457]
  • Anion arrangement analysis of oxynitride perovskite thin film with inverse photoelectron holography
    Y. Yamamoto, A. K. R. Ang, K. Kimura, T. Matsushita, Y. Hirose, D. Oka, and K. Hayashi
    J. Electron Spectrosc. Relat. Phenom. 246, 147018 (2021).
    [DOI: 10.1016/j.elspec.2020.147018]
2020
  • Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film
    Shoya Sakamoto, Kenichi Kaminaga, Daichi Oka, Ryu Yukawa, Masafumi Horio, Yuichi Yokoyama, Kohei Yamamoto, Kou Takubo, Yosuke Nonaka, Keisuke Koshiishi, Masaki Kobayashi, Arata Tanaka, Akira Yasui, Eiji Ikenaga, Hiroki Wadati, Hiroshi Kumigashira, Tomoteru Fukumura, and Atsushi Fujimori
    Phys. Rev. Mater. 4, 095001 (2020).
    [DOI: 10.1103/PhysRevMaterials.4.095001]
  • Rock-salt structure GdO epitaxial thin film with a high ferromagnetic Curie temperature
    Taku Yamamoto, Kenichi Kaminaga, Daichi Saito, Daichi Oka, and Tomoteru Fukumura
    Appl. Phys. Lett. 117, 052402 (2020).
    [DOI: 10.1063/5.0017954]
  • Width-induced metal-insulator transition in SrVO3 lateral nanowires spontaneously formed on the ultrathin film
    Hirofumi Oka, Yoshinori Okada, Kenichi Kaminaga, Daichi Oka, Taro Hitosugi and Tomoteru Fukumura
    Appl. Phys. Lett. 117, 051603 (2020).
    [DOI: 10.1063/5.0018240]
  • Epitaxial growth of bismuth oxyhalides thin films with mist CVD at atmospheric pressure
    Zaichun Sun, Daichi Oka, and Tomoteru Fukumura
    Chem. Comm. 56, 9481-9484 (2020).
    [DOI: 10.1039/D0CC03431B]
  • Direct growth and electrical properties of YH2 (111) epitaxial thin films on CaF2 (111) and (001) substrates by reactive magnetron sputtering
    Naoto Hasegawa, Hideyuki Kawasoko, Tomoteru Fukumura
    Chem. Lett. 49, 1181-1184 (2020).
    [DOI: 10.1246/cl.200420xx]
  • Thickness Effects on Crystal Growth and Metal?Insulator Transition in Rutile‐Type RuO2 (100) Thin Films
    Dai Kutsuzawa, Daichi Oka, Tomoteru Fukumura
    Phys. Status Solidi B 257, 2000188 (2020).
    [DOI: 10.1002/pssb.202000188]
  • Increased electrical conduction with high hole mobility in anti-ThCr2Si2-type La2O2Bi via oxygen intercalation adjacent to Bi square net
    Kota Matsumoto, Hideyuki Kawasoko, Hidetaka Kasai, Eiji Nishibori, Tomoteru Fukumura
    Appl. Phys. Lett. 116, 191901 (2020).
    [DOI: 10.1063/5.0005300]
  • Metal-to-insulator transition in Ruddlesden-Popper-type Srn+1VnO3n+1 (n = 1, 2) epitaxial thin films as a function of strain and VO2 stacking layer number
    Shintaro Fukuda, Daichi Oka, and Tomoteru Fukumura
    Appl. Phys. Lett. 116, 123101 (2020).
    [DOI: 10.1063/1.5136319]
  • Tetragonality induced superconductivity in anti-ThCr2Si2-type RE2O2Bi (RE = rare earth) with Bi square net
    Ryosuke Sei, Hideyuki Kawasoko, Kota Matsumoto, Masato Arimitsu, Kyohei Terakado, Daichi Oka, Shintaro Fukuda, Noriaki Kimura, Hidetaka Kasai, Eiji Nishibori, Kenji Ohoyama, Akinori Hoshikawa, Toru Ishigaki, Tetsuya Hasegawa, and Tomoteru Fukumura
    Dalton Trans. 49, 3321-3325 (2020).
    [DOI: 10.1039/C9DT04640B]
  • High-κ dielectric ε-Ga2O3 stabilized in a transparent heteroepitaxial structure grown by mist CVD at atmospheric pressure
    Subaru Yusa, Daichi Oka, and Tomoteru Fukumura
    CrystEngCom 22, 381-385 (2020).
    [DOI: 10.1039/C9CE01532A]
  • Analyses on atomic arrangement in dielectric ε-Ga2O3 epitaxial thin films
    Daichi Oka, Subaru Yusa, Koji Kimura, Artoni Kevin Roquero Ang, Naohisa Happo, Kouichi Hayashi, and Tomoteru Fukumura
    Jpn. J. Appl. Phys. 59, 010601 (2020).
    [DOI: 10.7567/1347-4065/ab58a1]
  • Temperature dependence of dielectric functions in Yb2O3 and Lu2O3 epitaxial thin films on sapphire (0001)
    Takayuki Makino, Takaho Asai, Tomoya Takeuchi, Kenichi Kaminaga, Daichi Oka, and Tomoteru Fukumura
    Jpn. J. Appl. Phys. 59, SCCB1 (2020).
    [DOI: 10.7567/1347-4065/ab4a88]
2019
  • Epitaxial Growth of β-Bi2O3 Thin Films and Particles with Mist Chemical Vapor Deposition
    Zaichun Sun, Daichi Oka, and Tomoteru Fukumura
    Cryst. Growth Des. 19, 7170-7174 (2019).
    [DOI: 10.1021/acs.cgd.9b01033]
  • Investigation of magnetism and magnetic structure of anti-ThCr2Si2-type Tb2O2Bi by magnetization and neutron diffraction measurements
    Hideyuki Kawasoko, Kenji Ohoyama, Ryosuke Sei, Kota Matsumoto, Daichi Oka, Akinori Hoshikawa, Toru Ishigaki, and Tomoteru Fukumura
    AIP Adv. 9, 115301 (2019).
    [DOI: 10.1063/1.5126399]
  • Heteroepitaxy of Rock-salt Superconductor/Ferromagnet Thin Film: LaO/EuO
    Kenichi Kaminaga, Daichi Oka, Hirofumi Oka, and Tomoteru Fukumura
    Chem. Lett. 48, 1244-1247 (2019).
    [DOI: 10.1246/cl.190460]
  • Synthesis and electronic properties of meso-tetra(3,4,5-trimethoxy)phenyl-porphyrin and -tetrabenzoporphyrin and their phosphorus complexestitle
    Taniyuki Furuyama, Yuichi Takahashi, Tomoteru Fukumura, Ana C. C. Bacilla, and Nagao Kobayashi
    J. Polphyrin. Phtalocyanine --, -- (2019).
    [DOI: 10.1142/S1088424619500871]
  • Itinerant ferromagnetism in rocksalt NdO epitaxial thin films
    Daichi Saito, Kenichi Kaminaga, Daichi Oka, and Tomoteru Fukumura
    Phys. Rev. Mater. 3, 064407 (2019).
    [DOI: 10.1103/PhysRevMaterials.3.064407]
  • Interstitialcy diffusion of fluoride ions in LaOF by DFT-based first-principles calculations
    Mayuko Oka, Hideyuki Kamisaka, Tomoteru Fukumura, and Tetsuya Hasegawa
    Comp. Mater. Sci. 167, 92-99 (2019).
    [DOI: 10.1016/j.commatsci.2019.05.028]
  • Synthesis, structural and optical properties of tetrabenzoporphyrin complexes bearing four or eight peripheral phenyl groupstitle
    Taniyuki Furuyama Tetsuo Okujima Kota Muramatsu, Yuichi Takahashi, Akihiro Mikami, Tomoteru Fukumura, Shigeki Mori, Takahiro Nakae, Masayoshi Takase, Hidemitsu Uno, and Nagao Kobayashir
    Euro. J. Org. Chem. 3224-3235 (2019).
    [DOI: 10.1002/ejoc.201900528]
  • High electron mobility with significant spin-orbit coupling in rock-salt YbO epitaxial thin film
    Taku Yamamoto, Kenichi Kaminaga, Daichi Saito, Daichi Oka, and Tomoteru Fukumura
    Appl. Phys. Lett. 14, 162104 (2019).
    [DOI: 10.1063/1.5085938]
  • Application of X‐ray fluorescence holography to the analysis of the interior and surface of an yttrium oxide thin film
    J. R. Stellhorn, S. Hosokawa, N. Happo, H. Tajiri, T. Matsushita, K. Kaminaga, T. Fukumura, T. Hasegawa, K. Kimura, K. Hayashi
    Surf. Interface Anal. 51, 70-73 (2019).
    [DOI: 10.1002/sia.6550]
2018
  • Application of X‐ray fluorescence holography to the analysis of the interior and surface of an yttrium oxide thin film
    J. R. Stellhorn, S. Hosokawa, N. Happo, H. Tajiri, T. Matsushita, K. Kaminaga, T. Fukumura, T. Hasegawa, K. Kimura, K. Hayashi
    Surface and Interface Analysis 51, 70 (2018).
    [DOI: 10.1002/sia.6550]
  • Two distinct surface terminations of SrVO3 (001) ultrathin films as an influential factor on metallicity
    H. Oka, Y. Okada, T. Hitosugi, and T. Fukumura
    Appl. Phys. Lett. 113, 171601 (2018).
    [DOI: 10.1063/1.5051434]
  • New Lutetium Oxide: Electrically Conducting Rock-Salt LuO Epitaxial Thin Film
    K. Kaminaga, D. Oka, T. Hasegawa, and T. Fukumura
    ACS Omega 3, 12501 (2018).
    [DOI: 10.1021/acsomega.8b02082]
  • Anion-Substitution-Induced Non-Rigid Variation of Band Structure in SrNbO3-xNx (0 ? x ? 1) Epitaxial Thin Films
    D. Oka, Y. Hirose, M. Kaneko, S. Nakao, T. Fukumura, K. Yamashita, and T. Hasegawa
    ACS Appl. Mater. Interfaces 10, 35008 (2018).
    [DOI: 10.1021/acsami.8b08577]
  • Superconductivity in anti-ThCr2Si2 type Er2O2Bi induced by incorporation of excess oxygen with CaO oxidant
    K. Terakado, R, Sei, H. Kawasoko, T. Koretsune, D. Oka, T. Hasegawa, and T. Fukumura
    Inorg. Chem. 57, 10587 (2018).
    [DOI: 10.1021/acs.inorgchem.8b01199]
  • Density functional theory-based ab initio molecular dynamics simulation of ionic conduction in N-/F-doped ZrO2 under epitaxial strain
    M. Oka, H. Kamisaka, T. Fukumura, and T. Hasegawa
    Comp. Mater. Sci. 154, 91 (2018).
    [DOI: 10.1016/j.commatsci.2018.07.038]
  • Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film
    K. Kaminaga, D. Oka, T. Hasegawa, and T. Fukumura
    J. Am. Chem. Soc. 140, 6754 (2018).
    [DOI: 10.1021/jacs.8b03009]
2017
  • A valence-selective X-ray fluorescence holography study of an yttrium oxide thin film
    J. R. Stellhorn, S. Hosokawa, N. Happo, H. Tajiri, T. Matsushita, K. Kaminaga, T. Fukumura, T. Hasegawa, and K. Hayashi
    J. Appl. Cryst. 50, 1583 (2017).
    [DOI: 10.1107/S1600576717012821]
  • Magnetic and magnetotransport properties of ThCr2Si2-type Ce2O2Bi composed of conducting Bi2- square net and magnetic Ce－O layer
    S. Shibata, R. Sei, T. Fukumura, and T. Hasegawa
    Appl. Phys. Lett. 110, 192410 (2017).
    [DOI: 10.1063/1.4983280]
  • Strain Engineering for Anion Arrangement in Perovskite Oxynitrides
    D. Oka , Y. Hirose, F. Matsui, H. Kamisaka, T. Oguchi, N. Maejima, H. Nishikawa, T. Muro, K. Hayashi, and T. Hasegawa
    ACS Nano 11, 3860 (2017).
    [DOI: 10.1021/acsnano.7b00144]
  • The Recovery of a Magnetically Dead Layer on the Surface of an Anatase (Ti,Co)O2 Thin Film via an Ultrathin TiO2 Capping Layer
    T. S. Krasienapibal, T. Fukumura, and T. Hasegawa
    Electronics 6, 23 (2017).
    [DOI: 10.3390/electronics6010023]
  • Samarium monoxide epitaxial thin film as a possible heavy-fermion compound
    Y. Uchida, K. Kaminaga, T. Fukumura, and T. Hasegawa
    Phys. Rev. B 95, 125111 (2017).
    [DOI: 10.1103/PhysRevB.95.125111]
  • Crystal engineering for novel functionalities with oxide thin film epitaxy
    D. Oka and T. Fukumura
    CrystEngComm 19, 2124 (2017).
    [DOI: 10.1039/C7CE00322F]
  • Topotactic fluorination of perovskite strontium ruthenate thin films using polyvinylidene fluoride
    K. Kawahara, A. Chikamatsu, T. Katayama, T. Onozuka, D. Ogawa, K. Morikawa, E. Ikenaga, Y. Hirose, I. Harayama, D. Sekiba, T. Fukumura and T. Hasegawa
    CrystEngComm 19, 313 (2017).
    [DOI: 10.1039/C6CE02358D]
2016
  • Two Dimensional Superconductivity Emerged at Monatomic Bi2- Square Net in Layered Y2O2Bi via Oxygen Incorporation
    Ryosuke Sei, Suguru Kitani, Tomoteru Fukumura, Hitoshi Kawaji, and Tetsuya Hasegawa
    J. Am. Chem. Soc. 138, 11085 (2016)
    [DOI: 10.1021/jacs.6b05275]
  • Formation of defect-fluorite structured NdNiOxHy epitaxial thin films via a soft chemical route from NdNiO3 precursors
    T. Onozuka, A. Chikamatsu, T. Katayama, T. Fukumura and T. Hasegawa
    Dalton Trans. 45, 12114 (2016).
    [DOI: 10.1039/C6DT01737A]
  • A divalent rare earth oxide semiconductor: Yttrium monoxide
    Kenichi Kaminaga, Ryosuke Sei, Kouichi Hayashi, Naohisa Happo, Hiroo Tajiri, Daichi Oka, Tomoteru Fukumura and Tetsuya Hasegawaa
    Appl. Phys. Lett. 108, 122102-1-4 (2016).
    [DOI: 10.1063/1.4944330] (Editor's Pick)
  • Topotactic reductive synthesis of A-site cation-ordered perovskite YBaCo2Ox (x = 4.5?5.5) epitaxial thin films
    Tsukasa Katayama, Akira Chikamatsu, Tomoteru Fukumura and Tetsuya Hasegawa
    Jpn. J. Appl. Phys 55, 04EJ05-1-4 (2016).
    [DOI: 10.7567/JJAP.55.04EJ05]
  • Curie temperature of Co-doped TiO2 as functions of carrier density and Co content evaluated from electrical transport and magnetization at low temperature regime
    Thantip S. Krasienapibal, Tomoteru Fukumura and Tetsuya Hasegawa
    AIP Advances 6, 055802-1-5 (2016).
    [DOI: 10.1063/1.4942554]
2015
  • Composition-induced structural, electrical, and magnetic phase transitions in AX-type mixed-valence cobalt oxynitride epitaxial thin films
    Jumpei Takahashi, Yasushi Hirose, Daichi Oka, Shoichiro Nakao, Chang Yang, Tomoteru Fukumura, Isao Harayama, Daiichiro Sekiba and Tetsuya Hasegawa
    Appl. Phys. Lett. 107, 231906-1-5 (2015).
    [DOI: 10.1063/1.4937431]
  • 2D Electronic Transport with Strong Spin?Orbit Coupling in Bi2- Square Net of Y2O2Bi Thin Film Grown by Multilayer Solid-Phase Epitaxy
    Ryosuke Sei, Tomoteru Fukumura, and Tetsuya Hasegawa
    ACS Appl. Mater. Interfaces 7, 24998-25001 (2015).
    [DOI: 10.1021/acsami.5b07825]
  • Intrinsic high electrical conductivity of stoichiometric SrNbO3 epitaxial thin films
    Daichi Oka, Yasushi Hirose, Shoichiro Nakao, Tomoteru Fukumura, and Tetsuya Hasegawa
    Phys. Rev. B 92, 205102-1-5 (2015).
    [DOI: 10.1103/PhysRevB.92.205102]
  • Topotactic synthesis of strontium cobalt oxyhydride thin film with perovskite structure
    Tsukasa Katayama, Akira Chikamatsu, Hideyuki Kamisaka, Yuichi Yokoyama, Yasuyuki Hirata, Hiroki Wadati, Tomoteru Fukumura and Tetsuya Hasegawa
    AIP Advances 5, 107147-1-7 (2015).
    [DOI: 10.1063/1.4935190]
  • Effects of Cr substitution on the magnetic and transport properties and electronic states of SrRuO3 epitaxial thin films
    Kaori Kurita, Akira Chikamatsu, Kei Shigematsu, Tsukasa Katayama, Hiroshi Kumigashira, Tomoteru Fukumura, and Tetsuya Hasegawa
    Phys. Rev. B 92, 115153-1-6 (2015).
    [DOI: 10.1103/PhysRevB.92.115153]
  • DFT-based ab initio MD simulation of the ionic conduction in doped ZrO2 systems under epitaxial strain
    Mayuko Oka, Hideyuki Kamisaka, Tomoteru Fukumura, and Tetsuya Hasegawa
    Phys. Chem. Chem. Phys. 17, 29057-29063 (2015).
    [DOI: 10.1039/C5CP03238E]
  • Low temperature epitaxial growth of anatase TaON using anatase TiO2 seed layer
    Atsushi Suzuki, Yasushi Hirose, Daichi Oka, Shoichiro Nakao, Tomoteru Fukumura and Tetsuya Hasegawa
    Jpn. J. Appl. Phys. 54, 080303-1-3 (2015).
    [DOI: 10.7567/JJAP.54.080303]
  • Spontaneous formation of suboxidic coordination around Co in ferromagnetic rutile Ti0.95Co0.05O2 film
    Wen Hu, Kouichi Hayashi, Tomoteru Fukumura, Kazuto Akagi, Masaru Tsukada, Naohisa Happo, Shinya Hosokawa, Kenji Ohwada, Masamitu Takahasi, Motohiro Suzuki and Masashi Kawasaki
    Appl. Phys. Lett. 106, 222403-1-5 (2015).
    [DOI: 10.1063/1.4921847]
  • Observation of magnetic domain structure in anatase (Ti,Co)O2 thin film at room temperature
    Thantip S. Krasienapibal, Shun Inoue, Tomoteru Fukumura and Tetsuya Hasegawa
    Appl. Phys. Lett. 106, 202402-1-4 (2015).
    [DOI: 10.1063/1.4921464.]
  • Effect of Central Metals on Langmuir-Blodgett Monolayers of Phthalocyanines with Flexible Substituents
    Shungo Kojima, Tomoteru Fukumura and Tetsuya Hasegawa
    e-J. Surf. Sci. Nanotech. 13, 155-158 (2015).
    [DOI: 10.1380/ejssnt.2015.155]
  • Epitaxial Strain-Controlled Ionic Conductivity in Li-Ion Solid Electrolyte Li0.33La0.56TiO3 Thin Films
    Jie Wei, Daisuke Ogawa, Tomoteru Fukumura, Yasushi Hirose, and Tetsuya Hasegawa
    Cryst. Growth Des. 15, 2187-2191 (2015).
    [DOI: 10.1021/cg501834s]
  • Topotactic reductive fluorination of strontium cobalt oxide epitaxial thin films
    Tsukasa Katayama, Akira Chikamatsu, Yasushi Hirose, Tomoteru Fukumura, and Tetsuya Hasegawa
    J. Sol-Gel Sci. Technol. 73, 527-530 (2015).
    [DOI: 10.1007/s10971-014-3499-x]
2014
  • Reductive solid phase epitaxy of layered Y2O2Bi with Bi2- square net from (Y, Bi) powders and Y2O3 amorphous thin film
    Ryosuke Sei, Tomoteru Fukumura and T. Hasegawa
    Cryst. Growth Des. 14, 4227-4229 (2014).
    [DOI: 10.1021/cg5009297]
  • Metallic transport and large anomalous Hall effect at room temperature in ferrimagnetic Mn4N epitaxial thin film
    Xi Shen, Akira Chikamatsu, Kei Shigematsu, Yasushi Hirose, Tomoteru Fukumura and Tetsuya Hasegawa
    Appl. Phys. Lett. 105, 072410-1-3 (2014).
    [DOI: 10.1063/1.4893732]
  • Improved room temperature electron mobility in self-buffered anatase TiO2 epitaxial thin film grown at low temperature
    Thantip S. Krasienapibal, Tomoteru Fukumura, Yasushi Hirose and Tetsuya Hasegawa
    Jpn. J. Appl. Phys. 53, 090305-1-3 (2014). (selected as Spotlights paper)
    [DOI: 10.7567/JJAP.53.090305]
  • Sr2MgMoO6-δ thin films fabricated using pulsed-laser deposition with high concentrations of oxygen vacancies
    Kei Shigematsu, Akira Chikamatsu, Tomoteru Fukumura, Satoshi Toyoda, Eiji Ikenaga and Tetsuya Hasegawa
    Appl. Phys. Lett. 104, 261901-1-4 (2014).
    [DOI: 10.1063/1.4886136]
  • Topotactic fluorination of strontium iron oxide thin films using polyvinylidene fluoride
    Tsukasa Katayama, Akira Chikamatsu, Yasushi Hirose, Ryosuke Takagi, Hideyuki Kamisaka, Tomoteru Fukumura and Tetsuya Hasegawa
    J. Mater. Chem. C 2, 5350-5356 (2014).
    [DOI: 10.1007/s10971-014-3499-x]
  • Possible ferroelectricity in perovskite oxynitride SrTaO2N epitaxial thin films
    Daichi Oka, Yasushi Hirose, Hideyuki Kamisaka, Tomoteru Fukumura, Kimikazu Sasa, Satoshi Ishii, Hiroyuki Matsuzaki, Yukio Sato, Yuichi Ikuhara and Tetsuya Hasegawa
    Sci. Rep. 4, 4987-1-6 (2014).
    [DOI: 10.1038/srep04987]
  • Carrier generation mechanism and effect of tantalum-doping in transparent conductive amorphous SnO2 thin films
    Shoishiro Nakao, Yasushi Hirose, Tomoteru Fukumura and Tetsuya Hasegawa
    Jpn. J. Appl. Phys. 53, 05FX04-1-4 (2014).
    [DOI: 10.7567/JJAP.53.05FX04]
  • Metallic conductivity in infinite-layer strontium iron oxide thin films reduced by calcium hydride
    Tsukasa Katayama, Akira Chikamatsu, Yasushi Hirose, Hiroshi Kumigashira, Tomoteru Fukumura and Tetsuya Hasegawa
    J. Phys. D: Appl. Phys. 47, 135304-1-6 (2014).
    [DOI: 10.1088/0022-3727/47/13/135304]
  • Fabrication and properties of micro capacitors with a one-nanometer-thick single Ti0.87O2 nanosheet
    Daisuke Ogawa, Kosho Akatsuka, Tomoteru Fukumura, Minoru Osada, Takayoshi Sasaki, and Tetsuya Hasegawa
    Chem. Lett. 43, 307-309 (2014).
    [DOI: 10.1246/cl.130925]
  • High-mobility electron conduction in oxynitride: anatase TaON
    Atsushi Suzuki, Yasushi Hirose, Daichi Oka, Shoichiro Nakao, Tomoteru Fukumura, Satoshi Ishii, Kimikazu Sasa, Hideyuki Matsuzaki and Tetsuya Hasegawa
    Chem. Mater. 26, 976-981 (2014).
    [DOI: 10.1021/cm402720d]
  • Quantum confinement effect in Bi anti-dot thin films with tailored pore wall widths and thicknesses
    Youngok Park, Yasushi Hirose, Shoichiro Nakao, Tomoteru Fukumura, Jimmy Xu and Tetsuya Hasegawa
    Appl. Phys. Lett. 104, 023106-1-4 (2014).
    [DOI: 10.1063/1.4861775]
  • Heteroepitaxial growth of perovskite CaTaO2N thin films by nitrogen plasma-assisted pulsed laser deposition
    Daichi Oka, Yasushi Hirose, Tomoteru Fukumura, and Tetsuya Hasegawa
    Cryst. Growth Des. 14, 87-90 (2014).
    [DOI: 10.1021/cg401176j]
2013
  • Solid phase epitaxy of EuTiO3 thin films on SrTiO3 (100) substrates with different oxygen contents
    K. Shimamoto, Y. Hirosea, S. Nakaob, T. Fukumura, T. Hasegawa
    J. Cryst. Growth 378, 243-245 (2013).
    [DOI:10.1016/j.jcrysgro.2012.12.117]
  • Electronic and transport properties of Eu-substituted infinite-layer strontium ferrite thin films
    A. Chikamatsu, T. Matsuyama, T. Katayama, Y. Hirose, H. Kumigashira, M. Oshima, T. Fukukmura, T. Hasegawa
    J. Cryst. Growth 378, 165-167 (2015).
    [DOI:10.1016/j.jcrysgro.2012.12.067]
  • Room temperature ferromagnetism induced by electric field in cobalt-doped TiO2
    T. Fukumura, Y. Yamada, K. Ueno, H. T. Yuan, H. Shimotani, Y. Iwasa, L. Gu, S. Tsukimoto, Y. Ikuhara, M. Kawasaki
    “ECS Transactions - Honolulu, Hawaii” Volume 50, pp. 53-57 (2013) "Dielectric Materials and Metals for Nanoelectronics and Photonics 10", from the Honolulu, HI meeting. (reviewed)
  • Electron carrier-mediated room temperature ferromagnetism in anatase (Ti,Co)O2
    T. Fukumura, Y. Yamada, K. Ueno, H. T. Yuan, H. Shimotani, Y. Iwasa, L. Gu, S. Tsukimoto, Y. Ikuhara, M. Kawasaki
    Spin 2, 1230005-1-10 (2012).
    [DOI:10.1142/S2010324712300058]
  • Full compensation of oxygen vacancies in EuTiO3 (100) epitaxial thin film stabilized by a SrTiO3 surface protection layer
    K. Shimamoto, K. Hatabayashi, Y. Hirose, S. Nakao, T. Fukumura, T. Hasegawa
    Appl. Phys. Lett. 102, 042902-1-4 (2013).
    [DOI:10.1063/1.4789778]
2012
  • Ultrafast optical control of magnetization in EuO thin films
    F. Liu, T. Makino, T. Yamazaki, K. Ueno, A. Tsukazaki, T. Fukumura, Y. Kong, M. Kawasaki
    Phys. Rev. B 86,064403-1-5 (2012).
    [DOI:10.1103/PhysRevB.86.064403.]
  • Ultrafast time-resolved Faraday rotation in EuO thin films
    F. Liu, T. Makino T. Yamazaki, K. Ueno, A. Tsukazaki, T. Fukumura, Y. Kong, M. Kawasaki
    Phys. Rev. Lett. 108,257401-1-5 (2012).
    [DOI:10.1103/PhysRevLett.108.257401. ]
  • Ferromagnetism of cobalt-doped anatase TiO2 studied by bulk- and surface-sensitive soft x-ray magnetic circular dichroism
    V. R. Singh, K. Ishigami, V. K. Verma, G. Shibata, Y. Yamazaki, T. Kataoka, A. Fujimori, F.-H. Chang, D.-J. Huang, H.-J. Lin, C. T. Chen, Y. Yamada, T. Fukumura, M. Kawasaki
    Appl. Phys. Lett. 100,242404-1-5 (2012).
    [DOI:10.1063/1.4729123. ]
  • Magnetic and dielectric properties of layered perovskite Gd2Ti2O7 thin film epitaxially stabilized on a perovskite single crystal
    T. Ukita, Y. Hirose, S. Ohno, K. Hatabayashi, T. Fukumura, T. Hasegawa
    J. Appl. Phys. 111,07D909-1-3 (2012).
    [DOI: 10.1063/1.3673546. ]
  • Enhanced coercivity of half-metallic La0.7Sr0.3MnO3 by Ru substitution under in-plane uniaxial strain
    K. Shigematsu, A. Chikamatsu, Y. Hirose, T. Fukumura, T. Hasegawa
    J. Appl. Phys. 111,07B102-1-3 (2012).
    [DOI: 10.1063/1.3672852. ]
2011
  • Control of ferromagnetism at room temperature in (Ti,Co)O2-δ via chemical doping of electron carriers
    Y. Yamada, T. Fukumura, K. Ueno and M. Kawasaki
    Appl. Phys. Lett. 99, 242502-1-3 (2011).
    [DOI:10.1063/1.3669505]
  • Electronic structure of delafossite-type CuMO2 (M = Sc, Cr, Mn, Fe and Co): Optical absorption measurements and first-principles calculations
    H. Hiraga, T. Makino, T. Fukumura, H. M. Weng and M. Kawasaki
    Phys. Rev. B 84, 041411(R)-1-4 (2011).
    [DOI:10.1103/PhysRevB.84.041411]
  • Electrically-induced ferromagnetism at room temperature in cobalt-doped titanium dioxide
    Y. Yamada, K. Ueno, T. Fukumura, H. T. Yuan, H. Shimotani, Y. Iwasa, L. Gu, S. Tsukimoto, Y. Ikuhara, and M. Kawasaki
    Science 332, 1065-1067 (2011).
    [DOI:10.1126/science.1202152]
  • Bulk and surface magnetization of Co atoms in rutile Ti1-xCoOxO2-δ thin film revealed by X-ray magnetic circular dichroism
    V. R. Singth, Y. Sakamoto, T. Kataoka, M. Kobayashi, Y. Yamazaki, A. Fujimori, F. H. Chang, D. J. Huang, H. J. Lin, C. T. Chen, H. Toyosaki, T. Fukumura and M. Kawasaki
    J. Phys.: Condens. Matter 23, 176001-1-5 (2011).
    [DOI:10.1088/0953-8984/23/17/176001]
  • Observation of anomalous Hall effect in EuO epitaxial thin film grown by pulse laser deposition method
    T. Yamasaki, K. Ueno, A. Tsukazaki, T. Fukumura and M. Kawasaki
    Appl. Phys. Lett. 98, 082116-1-3 (2011).
    [DOI:10.1063/1.3557050]
  • Carrier doping into SrFeO2 epitaxial thin films by Eu-substitution
    T. Matsuyama, A. Chikamatsu, Y. Hirose, T. Fukumura and T. Hasegawa
    Appl. Phys. Express 4, 013001-1-3 (2011).
    [DOI:10.1143/APEX.4.013001]
2010
  • High throughput screening of magneto-optical properties in spinel ferrite (Zn,Co)Fe2O4 solid solution epitaxial film with a composition-spread approach
    Yosuke Iwasaki, Tomoteru Fukumura, Hisamichi Kimura, Akira Ohkubo, Tetsuya Hasegawa, Yasushi Hirose, Takayuki Makino, Kazunori Ueno and Masashi Kawasaki
    Appl. Phys. Express 3, 103001-1-3 (2010).
    [DOI: 10.1143/APEX.3.103001]
  • Ultrafast dynamics of excitons in delafossite CuScO2 thin films
    Fucai Liu, Takayuki Makino, Hiroki Hiraga, Tomoteru Fukumura, Yongfa Kong and Masashi Kawasaki
    Appl. Phys. Lett. 96, 211904-1-3 (2010).
    [DOI: 10.1063/1.3436548]
  • Electric field control of two-dimensional electrons in polymer-gated oxide semiconductor heterostructures
    Masaki Nakano, Atsushi Tsukazaki, Akira Ohtomo, Kazunori Ueno, Shunsuke Akasaka, Hiroyuki Yuji, Ken Nakahara, Tomoteru Fukumura and Masashi Kawasaki
    Adv. Mater. 22, 876-879 (2010).
    [DOI: 10.1002/adma.200902162]
  • Spatial distribution of two-dimensional electron gas in a ZnO/Mg0.2Zn0.8O heterostructure probed with a conducting polymer Schottky contact
    Masaki Nakano, Atsushi Tsukazaki, Kazunori Ueno, Ryo-Yu Gunji, Akira Ohtomo, Tomoteru Fukumura and Masashi Kawasaki
    Appl. Phys. Lett. 96, 052116-1-3 (2010).
    [DOI: 10.1021/cg501834s]
  • Interplay between magnetic impurities and photo-induced carriers in surface depletion layer of anatase Ti1-xCoxO2-δ thin film probed by x-ray photoemission spectroscopy
    N. Yamashita, S. Sudayama, T. Mizokawa, Y. Yamada, T. Fukumura, M. Kawasaki
    Appl. Phys. Lett. 96, 021907-1-3 (2010).
    [DOI: 10.1063/1.3291680]