研究者詳細 - 村岡　祐治

論文 - 村岡　祐治

分割表示 184 件中 1 - 20 件目／全件表示 >>

Local-structure insight into the improved superconducting properties of Pb-substituted La(O, F)BiS2: a photoelectron holography study 査読

YaJun Li, Yusuke Hashimoto, Noriyuki Kataoka, Zexu Sun, Sota Kawamura, Hiroto Tomita, Taro Setoguchi, Soichiro Takeuchi, Shunjo Koga, Kohei Yamagami, Yoshinori Kotani, Satoshi Demura, Kanako Noguchi, Hideaki Sakata, Tomohiro Matsushita, Takanori Wakita, Yuji Muraoka, Takayoshi Yokoya

Scientific Reports 15 ( 1 ) 8366 - 8366 2025年3月

First-principles calculations concerning ferromagnetism in Q-carbon 査読

Qiang Yue, Takayoshi Yokoya, Yuji Muraoka

Diamond and Related Materials 151 111807 - 111807 2025年1月

Effects of thermal energy on the formation of lattice strain in VO2 thin films grown on TiO2(001) 査読

Reki Nakamoto, Hiroyuki Okazaki, Takanori Wakita, Takayoshi Yokoya, Yuji Muraoka

Langmuir 40 ( 46 ) 24447 - 24454 2024年11月

Reversible modulations of insulator–metal transition in an epitaxial VO2 film through thermal crystallization and femtosecond laser-induced-amorphization of capping Ge2Sb2Te5 layer 査読

Takuto Ohnuki, Kunio Okimura, Yiqi Liu, Shoya Inagaki, Yuji Muraoka, Joe Sakai, Aiko Narazaki, Masashi Kuwahara

Journal of Applied Physics 136 ( 8 ) 085305 2024年8月

First-principles molecular dynamics simulations for the properties of boron-doped tetrahedral amorphous carbon 査読

Qiang Yue, Takayoshi Yokoya, Yuji Muraoka

Diamond and Related Materials 143 110894 2024年2月

Modulation of insulator metal transition of VO₂ films grown on Al2O3 (001) and TiO2 (001) substrates by the crystallization of capping Ge2Sb2Te5 layer 査読

Takuto Ohnuki, Kunio Okimura, Reki Nakamoto, Yuji Muraoka, Joe Sakai, Masashi Kuwahara

134 ( 24 ) 245302 2023年12月

Molecular dynamics simulation of deposition of amorphous carbon films on sapphire surfaces 査読

Qiang Yue, Takayoshi Yokoya, Yuji Muraoka

Diamond and Related Materials 140 110514 2023年12月

Photoelectron holographic evidence for the incorporation site of Se and suppressed atomic displacement of the conducting layer of La(O,F)BiSSe 査読

YaJun Li, ZeXu Sun, Noriyuki Kataoka, Taro Setoguchi, Yusuke Hashimoto, Soichiro Takeuchi, Shunjo Koga, Kazuhisa Hoshi, Yoshikazu Mizuguchi, Tomohiro Matsushita, Takanori Wakita, Yuji Muraoka, Takayoshi Yokoya

62 ( 12 ) 125001 - 125001 2023年11月

Photoelectron Holography Study of La(O,F)BiS₂ 査読

YaJun Li, ZeXu Sun, Noriyuki Kataoka, Taro Setoguchi, Yusuke Hashimoto, Soichiro Takeuchi, Shunjo Koga, Satoshi Demura, Kanako Noguchi, Hideaki Sakata, Yoshikazu Mizuguchi, Tomohiro Matsushita, Takanori Wakita, Yuji Muraoka, Takayoshi Yokoya

Journal of the Physical Society of Japan 92 ( 4 ) 044801 2023年4月

Self-organized vertical multilayer structures in spinodally decomposed TiO2-VO2 films on glass substrates 査読

Yuji Muraoka, Kazutada Takeda, Yoshito Takemoto, Takanori Wakita, Takayoshi Yokoya

Thin Solid Films 769 139749 - 139749 2023年3月

Magnetic-Field-Induced Insulator Metal Transition of W-doped VO2 Observed by Electromagnetic Flux Compression at ISSP 査読

Yasuhiro H. Matsuda, Yuji Muraoka, Daisuke Nakamura, Akihiko Ikeda, Yuto Ishii, Xu-Guang Zhou, Hironobu Sawabe, Shojiro Takeyama

J. Phys. Soc. Jpn. 91 ( 10 ) 101008 2022年10月

Anomalously large spin-dependent electron correlation in the nearly half-metallic ferromagnet CoS2 査読

Hirokazu Fujiwara, Kensei Terashima, Junya Otsuki, Nayuta Takemori, Harald O. Jeschke, Takanori Wakita, Yuko Yano, Wataru Hosoda, Noriyuki Kataoka, Atsushi Teruya, Masashi Kakihana, Masato Hedo, Takao Nakama, Yoshichika Ōnuki, Koichiro Yaji, Ayumi Harasawa, Kenta Kuroda, Shik Shin, Koji Horiba, Hiroshi Kumigashira, Yuji Muraoka, Takayoshi Yokoya

Physical Review B 106 ( 8 ) 085114 2022年8月

Incorporation Site and Valence State of Sn Atoms in Sn-Substituted La(O,F)BiS2 Superconductor 査読

YaJun Li, ZeXu Sun, Noriyuki Kataoka, Taro Setoguchi, Yusuke Hashimoto, Soichiro Takeuchi, Shunjo Koga, Takayuki Muro, Satoshi Demura, Kanako Noguchi, Hideaki Sakata, Tomohiro Matsushita, Ikuto Kawasaki, Shin-ichi Fujimori, Takanori Wakita, Yuji Muraoka, Takayoshi Yokoya

J. Phys. Soc. Jpn. 91 ( 5 ) 054602 2022年4月

Strain relaxation and spinodal decomposition in composition adjusted TiO2-VO2 films on TiO2(100) substrates 査読

Takahiro Fukuda, Yoshito Takemoto, Takanori Wakita, Takayoshi Yokoya, Yuji Muraoka

Thin Solid Films 751 139210 2022年4月

Soft x-ray irradiation induced metallization of layered TiNCl 査読

Noriyuki Kataoka, Masashi Tanaka, Wataru Hosoda, Takumi Taniguchi, Shin-ichi Fujimori, Takanori Wakita, Yuji Muraoka, Takayoshi Yokoya

Journal of Physics: Condensed Matter 33 ( 3 ) 035501 - 035501 2021年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IOP Publishing

We have performed soft x-ray spectroscopy in order to study the photoirradiation time dependence of the valence band structure and chemical states of layered transition metal nitride chloride TiNCl. Under the soft x-ray irradiation, the intensities of the states near the Fermi level (E-F) and the Ti3+ component increased, while the Cl 2p intensity decreased. Ti 2p-3d resonance photoemission spectroscopy confirmed a distinctive Fermi edge with Ti 3d character. These results indicate the photo-induced metallization originates from deintercalation due to Cl desorption, and thus provide a new carrier doping method that controls the conducting properties of TiNCl.

DOI： 10.1088/1361-648x/abbbc3

Web of Science

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その他リンク： https://iopscience.iop.org/article/10.1088/1361-648X/abbbc3/pdf

Magnetic-field-induced insulator–metal transition in W-doped VO2 at 500 T 査読

Yasuhiro H. Matsuda, Daisuke Nakamura, Akihiko Ikeda, Shojiro Takeyama, Yuki Suga, Hayato Nakahara, Yuji Muraoka

Nature Communications 11 ( 1 ) 3591 2020年12月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Science and Business Media LLC

Metal-insulator (MI) transitions in correlated electron systems have long been a central and controversial issue in material science. Vanadium dioxide (VO2) exhibits a first-order MI transition at 340 K. For more than half a century, it has been debated whether electron correlation or the structural instability due to dimerised V ions is the more essential driving force behind this MI transition. Here, we show that an ultrahigh magnetic field of 500 T renders the insulator phase of tungsten (W)-doped VO2 metallic. The spin Zeeman effect on the d electrons of the V ions dissociates the dimers in the insulating phase, resulting in the delocalisation of electrons. As the Mott-Hubbard gap essentially does not depend on the spin degree of freedom, the structural instability is likely to be the more essential driving force behind the MI transition.

DOI： 10.1038/s41467-020-17416-w

Web of Science

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その他リンク： http://www.nature.com/articles/s41467-020-17416-w

Formation of Q-carbon by adjusting sp3 content in diamond-like carbon films and laser energy density of pulsed laser annealing 査読

Hiroki Yoshinaka, Seiko Inubushi, Takanori Wakita, Takayoshi Yokoya, Yuji Muraoka

Carbon 167 504 - 511 2020年10月

Change in the electronic structure of the bismuth chalcogenide superconductor CsBi4-xPbxTe6 by dissociation of the bismuth dimers 査読

Hiroyuki Okazaki, Kensei Terashima, David Billington, Keiji Iwata, Takanori Wakita, Masashi Tanaka, Yoshihiko Takano, Yuji Muraoka, Takayoshi Yokoya

JOURNAL OF PHYSICS-CONDENSED MATTER 32 ( 14 ) 145501-1 - 145501-7 2020年4月

Change in the work function of VO2 thin film across the metal-insulator transition in VO2/TiO2:Nb(001) heterostructures 査読

Yuji Muraoka, Yuki Suga, Hayato Nakahara, Takayoshi Yokoya

JPS Conf. Proc. 30 011071 - 011071 2020年3月

Strain effects on spinodal decomposition in TiO2-VO2 films on TiO2(100) substrates 査読

Yuji Muraoka, Fumiya Yoshii, Takahiro Fukuda, Yuji Manabe, Mikiko Yasuno, Yoshito Takemoto, Kensei Terashima, Takanori Wakita, Takayoshi Yokoya

698 137854 2020年2月

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論文 - 村岡　祐治