Coupling between unconventional quantum-critical fluctuations and superconductivity in layered superconductors
| Project/Area Number |
15H03693
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
Aoki Yuji 首都大学東京, 理工学研究科, 教授 (20231772)
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| Co-Investigator(Renkei-kenkyūsha) |
MATSUDA Tatsuma 首都大学東京, 理工学研究科, 准教授 (30370472)
HIGASHINAKA Ryuji 首都大学東京, 理工学研究科, 助教 (30435672)
MIZUGUCHI Yoshikazu 首都大学東京, 理工学研究科, 准教授 (50609865)
HIGEMOTO Wataru 独立行政法人日本原子力研究開発機構, 先端基礎研究センター, 研究主幹 (90291103)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥14,560,000 (Direct Cost: ¥11,200,000、Indirect Cost: ¥3,360,000)
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| Keywords | BiS2層状超伝導体 / 量子臨界的挙動 / 空間反転対称性の破れ / ファンデルワールス層状物質 / 純良単結晶育成 / BiS2系超伝導体 / ファンデルワールス積層構造 / スピン軌道結合 / 超伝導材料 / BiS2系 / BiS2伝導層 / 層状超伝導体 |
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| Outline of Final Research Achievements |
BiS2-based superconductors are pseudo-2D materials consisting of alternating stacks of block layers, which possess rare-earth ions, and BiS2 conducting layers. We have grown high-quality single crystals with controlled carrier doping for each rare-earth elements, and have studied the anisotropies of 4f-electron magnetism and electronic conduction as well as the coupling between the two.
We have found at low temperatures that unconventional quantum critical behaviors (logT divergence in the specific heat) appearing in Ce-based materials in a nonmetallic state and heavy-fermion behaviors in Nd-based materials. In the superconducting state, we have found anomalous behaviors of the upper critical field Hc2, i.e., largely enhanced Hc2 caused by the breaking of the local inversion symmetry at the electronically active BiS2 bilayers and its anomalous temperature dependence suggesting different gap sizes on the Fermi surface.
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Report
(4 results)
Research Products
(63 results)
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[Journal Article] Electronic structure of self-doped layered Eu3F4Bi2S4 material revealed by x-ray absorption spectroscopy and photoelectron spectromicroscopy2017
Author(s)
E. Paris, T. Sugimoto, T. Wakita, A. Barinov, K. Terashima, V. Kandyba, O. Proux, J. Kajitani, R. Higashinaka, T. D. Matsuda, Y. Aoki, T. Yokoya, T. Mizokawa, and N. L. Saini
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Journal Title
Phys. Rev. B
Volume: 95
Issue: 3
Pages: 035152-035152
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Localized and mixed valence state of Ce 4f in superconducting and ferromagnetic CeO1-xFxBiS2 revealed by x-ray absorption and photoemission spectroscopy2016
Author(s)
T. Sugimoto, D. Ootsuki, E. Paris, A. Iadecola, M. Salome, E. F. Schwier, H. Iwasawa, K. Shimada, T. Asano, R. Higashinaka, T. D. Matsuda, Y. Aoki, N. L. Saini, and T. Mizokawa
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Journal Title
Phys. Rev. B
Volume: 94
Issue: 8
Pages: 081106-081106
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Mixed valence state (SmxLa1-x)Tr2Al202016
Author(s)
Akira Yamada, Ryuji Higashinaka, Kengo Fushiya, Takuya Asano, Tatsuma D. Matsuda, Masaichiro Mizumaki, Satoshi Tsutsui, Kiyofumi Nitta, Toshiaki Ina, Tomoya Uruga and Yuji Aoki
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Journal Title
J. Phys.: Conf. Ser.
Volume: 683
Pages: 0120201-6
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] Fermi surfaces and orbital polarization in superconducting CeO0.5F0.5BiS2 revealed by angle-resolved photoemission spectroscopy2015
Author(s)
T. Sugimoto, D. Ootsuki, C. Morice, E. Artacho, S. S. Saxena, E. F. Schwier, M. Zheng, Y. Kojima, H. Iwasawa, K. Shimada, M. Arita, H. Namatame, M. Taniguchi, M. Takahashi, N. L. Saini, T. Asano, R. Higashinaka, T. D. Matsuda, Y. Aoki, and T. Mizokawa
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Journal Title
PHYSICAL REVIEW B
Volume: 92
Issue: 4
Pages: 041113-041113
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Ln(O1-xFx)BiS2(Ln=Ce,Nd) の磁場中muSR2018
Author(s)
髭本亘, 伊藤孝, 大嶋浩平, 岡澤赳, 友野大, 三原基嗣, 三田昌明, 東中隆二, 松田達磨, 青木勇二
Organizer
日本物理学会第73回年次大会
Related Report
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[Presentation] R(O,F)BiS2 のフェルミ面と電荷軌道不安定性2018
Author(s)
守田智洋, 岡本陽平, 松澤悠, 溝川貴司, Eike Schwier, 島田賢也, Naurang Saini, 梶谷丈, 東中隆二, 松田 達磨, 青木勇二
Organizer
日本物理学会第73回年次大会
Related Report
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[Presentation] Pr(O,F)BiS2 の電子構造と原子価状態2018
Author(s)
松澤悠, 黒川輝風, 岡本陽平, 守田智洋, 溝川貴司, E.F.Shwier, 島田賢也, Naurang Saini, 東中隆二, 松田 達磨, 青木勇二
Organizer
日本物理学会第73回年次大会
Related Report
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[Presentation] 角度分解光電子分光によるR(O,F)BiS2 のバンド構造2017
Author(s)
守田智洋, 岡本陽平, 松澤悠, 溝川貴司, Eike Schwier, 島田賢也, Naurang Saini, 梶谷丈, 東中隆二, 松田 達磨, 青木勇二
Organizer
日本物理学会第2017年秋季大会
Related Report
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[Presentation] 光電子分光によるR(O,F)BiS2 の電子状態2017
Author(s)
黒川輝風, 松澤悠, 岡本陽平, 守田智洋, 溝川貴司, E. F. Schwier, 島田賢也, Naurang Saini, 梶谷丈, 東中 隆二, 松田達磨, 青木勇二
Organizer
日本物理学会第2017年秋季大会
Related Report
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[Presentation] Fermi surfaces and orbital polarization of CeO0.5F0.5BiS2 revealed by angle-resolved photoemission spectroscopy2015
Author(s)
杉本拓也, 大槻太毅, Corentin Morice, Emilio Artacho, S. S. Saxena, 高橋雅也, E. F. Schwier, 岩沢 英明, 島田賢也, 有田将司, 生田目博文, 谷口雅樹, Naurang L Saini, 浅野卓也, 中島卓也, 東中隆二, 松田達磨, 青木勇二, 溝川貴司
Organizer
日本物理学会2015 年秋季大会
Place of Presentation
関西大学
Year and Date
2015-09-16
Related Report
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