岡本佳比古/OKAMOTO Yoshihiko

主要な業績

1. Large Magnetic-Field-Induced Strain at the Magnetic Order Transition in Triangular Antiferromagnet AgCrS2,
Tomoya Kanematsu, Yoshihiko Okamoto*, and Koshi Takenaka,
Appl. Phys. Lett. 118, 142404(1-5) (2021) (arXiv:2104.03471).
(プレスリリース:磁場により体積が大きく膨張する新機構の発見)

2. High-Mobility Carriers Induced by Chemical Doping in the Candidate Nodal-Line Semimetal CaAgP,
Yohihiko Okamoto*, Kazushige Saigusa, Taichi Wada, Youichi Yamakawa, Ai Yamakage, Takao Sasagawa, Naoyuki Katayama, Hiroshi Takatsu, Hiroshi Kageyama, and Koshi Takenaka,
Phys. Rev. B, 102, 115101(1-6) (2020) (arXiv:2008.06188).

3. Regular-Triangle Trimer and Charge Order Preserving the Anderson Condition in the Pyrochlore Structure of CsW2O6,
Yoshihiko Okamoto*, Haruki Amano, Naoyuki Katayama, Hiroshi Sawa, Kenta Niki, Rikuto Mitoka, Hisatomo Harima, Takumi Hasegawa, Norio Ogita, Yu Tanaka, Masashi Takigawa, Yasunori Yokoyama, Kanji Takehana, Yasutaka Imanaka, Yuto Nakamura, Hideo Kishida, and Koshi Takenaka,
Nat. Commun. 11, 3144(1-8) (2020) (open access) (arXiv:2006.11053).
(プレスリリース:固体物質における正三角形の分子の形成をとらえた!)
(Press Release:Unusual electron sharing found in cool crystal)
(報道:科学新聞2020年7月3日「名古屋大など 正三角形の分子形成 固体物質で初の発見」)
(紹介記事:academist Journal 2020年7月27日 「固体物質における「正三角形の分子」をとらえた! – パイロクロア構造に現れた新しいタイプの電子の自己組織化」)
(解説動画:新学術領域研究「量子液晶」QLCチャンネル

4. Hole-Doped M4SiTe4 (M = Ta, Nb) as an Efficient p-Type Thermoelectric Material for Low-Temperature Applications,
Yoshihiko Okamoto, Yuma Yoshikawa, Taichi Wada, and Koshi Takenaka,
Appl. Phys. Lett. 115, 043901(1-5) (2019) (arXiv:1907.10254).
(Editor's Pick)
(プレスリリース:低温用の熱電素子に使用できる高性能材料の発見)
(報道:化学工業日報2019年7月30日「低温冷却素子に高性能材料 名古屋大」他)
(紹介記事:低温用の熱電素子に使用できる高性能材料, 岡本佳比古, クリーンエネルギー 29, 1, 46-50 (2020).)

5. Large Thermoelectric Power Factor at Low Temperatures in One-Dimensional Telluride Ta4SiTe4,
Takumi Inohara, Yoshihiko Okamoto, Youichi Yamakawa, Ai Yamakage, and Koshi Takenaka,
Appl. Phys. Lett. 110, 183901(1-5) (2017) (arXiv:1705.00404).
(プレスリリース:
低温で高い性能を示す熱電変換材料の発見)
(報道:化学工業日報2017年5月2日「低温でも高い性能 電子機器を局所冷却」他)
(Press Release:
One-Dimensional Crystals for Low-Temperature Thermoelectric Cooling)

6. Colossal Negative Thermal Expansion in Reduced Layered Ruthenate,
Koshi Takenaka, Yoshihiko Okamoto, Tsubasa Shinoda, Naoyuki Katayama, and Yuki Sakai,
Nat. Commun. 8, 14102(1-7) (2017) (open access).
(プレスリリース:
温めると縮む新材料を発見
(報道:朝日新聞2017年1月11日「温めると縮む新材料 開発」他)
(Press Release:
Record-Breaking Material that Contracts When Heated)

7. Superconductivity in the Hexagonal Ternary Phosphide ScIrP,
Yoshihiko Okamoto, Takumi Inohara, Youichi Yamakawa, Ai Yamakage, and Koshi Takenaka,
J. Phys. Soc. Jpn. 85, 013704(1-5) (2016) (arXiv:1512.03864).

8. Thermoelectric Properties of Antiperovskite Calcium Oxides Ca3PbO and Ca3SnO,
Yoshihiko Okamoto, Akira Sakamaki, and Koshi Takenaka,
J. Appl. Phys. 119, 205106(1-5) (2016) (arXiv:1604.06541).

9. Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAgX (X = P, As),
Ai Yamakage, Youichi Yamakawa, Yukio Tanaka, and Yoshihiko Okamoto,
J. Phys. Soc. Jpn. 85, 013708(1-4) (2016) (open access) (arXiv:1510.00202).
(Over 100 times cited)
(Highly Cited Paper in Essential Science Indicators, Thomson Reuters)
(Most Cited Articles in 2017 from Vol. 85 (2016))
(日本物理学会第24回論文賞)

10. Breathing Pyrochlore Lattice Realized in A-site Ordered Spinel Oxides LiGaCr4O8 and LiInCr4O8,
Yoshihiko Okamoto, G
øran J. Nilsen, J. Paul Attfield, and Zenji Hiroi,
Phys. Rev. Lett. 110, 097203(1-5) (2013) (arXiv:1301.6936).

11. Itinerant-Electron Magnet of the Pyrochlore Lattice: Indium-Doped YMn2Zn20,
Yoshihiko Okamoto, Takeshi Shimizu, Jun-ichi Yamaura, Yoko Kiuchi, and Zenji Hiroi,
J. Phys. Soc. Jpn. 79, 093712(1-4) (2010) (arXiv:1008.0835).
(JPSJ Editors' Choice)

12. Vesignieite BaCu3V2O8(OH)2 as a Candidate Spin-1/2 Kagome Antiferromagnet,
Yoshihiko Okamoto, Hiroyuki Yoshida and Zenji Hiroi,
J. Phys. Soc. Jpn. 78, 033701(1-4) (2009) (open access) (arXiv:0901.2237).
(Over 100 times cited)
(JPSJ Editors' Choice)

(報道:科学新聞2009年4月3日「カゴメ格子に量子スピン配列 新物質を発見」)
(紹介記事:カゴメ格子上に配列したスピン:銅鉱物ベシニエ石, 岡本佳比古, 広井善二, 固体物理 44, 473 (2009).)

13. Band Jahn-Teller Instability and Formation of Valence Bond Solid in a Mixed-Valent Spinel Oxide LiRh2O4,
Yoshihiko Okamoto, Seiji Niitaka, Masaya Uchida, Takeshi Waki, Masashi Takigawa, Yoshitaka Nakatsu, Akira Sekiyama, Shigamasa Suga, Ryotaro Arita, and Hidenori Takagi,
Phys. Rev. Lett. 101, 086404(1-4) (2008) (arXiv:0806.2504).
(紹介記事: RIKEN Research, 4 (1), 6 (2009), "Oxides flex their bonds".)

14. Spin-Liquid State in the S = 1/2 Hyperkagome Antiferromagnet Na4Ir3O8,
Yoshihiko Okamoto, Minoru Nohara, Hiroko Aruga-Katori, and Hidenori Takagi,
Phys. Rev. Lett. 99, 137207(1-4) (2007) (arXiv:0705.2821).
(紹介記事:
RIKEN Research, 3 (4), 3 (2008), "Exotic material keeps frustrated electrons flipping".)
(Over 300 times cited)
(Highly Cited Paper in Essential Science Indicators, Thomson Reuters)

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