Studies on unusual normal state properties and spin/orbital physics in iron-based superconductors
Project/Area Number |
24684026
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Research Category |
Grant-in-Aid for Young Scientists (A)
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Allocation Type | Partial Multi-year Fund |
Research Field |
Condensed matter physics II
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Research Institution | Kyoto University |
Principal Investigator |
KASAHARA SHIGERU 京都大学, 理学(系)研究科(研究院), 助教 (10425556)
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Project Period (FY) |
2012-04-01 – 2015-03-31
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Project Status |
Completed (Fiscal Year 2015)
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Budget Amount *help |
¥27,300,000 (Direct Cost: ¥21,000,000、Indirect Cost: ¥6,300,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2012: ¥21,710,000 (Direct Cost: ¥16,700,000、Indirect Cost: ¥5,010,000)
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Keywords | 鉄系超伝導 / 量子臨界点 / 電子ネマティック状態 / 擬ギャップ / 多軌道自由度 / 超シャロウバンド / BCS-BECクロスオーバー / 新奇超伝導状態 / 軌道秩序 / 量子振動 / フェルミエネルギー / 新奇量子凝縮状態 / 量子臨界性 / ネマティック秩序 / 超伝導ギャップ構造 / スピン揺らぎ / 強相関電子系 / 超伝導揺らぎ / 非従来型超伝導 |
Outline of Final Research Achievements |
In iron-based superconductors, spin and orbital degrees of freedom play an important role. An important task in the community is thus to uncover the unusual normal state properties related to the spin/orbital degrees of freedom. In this work, we have focused on the studies of quantum critical point (QCP) hidden beneath the superconducting dome as well as the electronic nematic transition above there. Our studies based on clean single crystals of BaFe2(As1-xPx)2 show the first evidence for the QCP beneath the superconducting dome, as well as the nematic transition in the normal state. These findings provide important clues for the understanding of iron-based superconductors. In the last year of this project, we have also investigated anomalous electronic properties and quantum condensate in iron-chalchogenides. In newly developed single crystals of FeSe, a cross-over from weakly coupled BCS state to tightly bound BEC state, as well as a possible new high-field phase have been found.
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Report
(4 results)
Research Products
(87 results)
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[Journal Article] Field-Induced Superconducting Phase of FeSe in the BCS-BEC Crossover2014
Author(s)
S. Kasahara, T. Watashige, T. Hanaguri, Y. Kohsaka, T. Yamashita, Y. Shimoyama, Y. Mizukami, R. Endo, H. Ikeda, K. Aoyama, T. Terashima, S. Uji, T. Wolf, H. v. Loehneysen, T. Shibauchi, Y. Matsuda
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Journal Title
Proceedings of the National Academy of Sciences of the United States of America
Volume: 111
Issue: 46
Pages: 16309-16313
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Anomalous Fermi surface in FeSe seen by Shubnikov-de Haas oscillation measurements2014
Author(s)
Taichi Terashima, Naoki Kikugawa, Andhika Kiswandhi, Eun-Sang Choi, James S. Brooks, Shigeru Kasahara, Tatsuya Watashige, Hiroaki Ikeda, Takasada Shibauchi, Yuji Matsuda, Thomas Wolf, Anna E. Bohmer, Frederic Hardy, Christoph Meingast, Hilbert v. Lohneysen, Michi-To Suzuki, Ryotaro Arita, Shinya Uji
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Journal Title
Physical Review B
Volume: 90
Issue: 14
Pages: 144517-144517
DOI
Related Report
Peer Reviewed
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[Journal Article] Direct Observation of Lattice Symmetry Breaking at the Hidden-Order Transition in URu2Si22014
Author(s)
S. Tonegawa, S. Kasahara, T. Fukuda, K. Sugimoto, N. Yasuda, Y. Tsuruhara, D. Watanabe, Y. Mizukami, Y. Haga, T. D. Matsuda, E. Yamamoto, Y. Onuki, H. Ikeda, Y. Matsuda, and T. Shibauchi,
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Journal Title
Nat. Commun.
Volume: 5
Issue: 1
Pages: 4188-4188
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] On Infrared Pseudogap in Cuprate and Pnictide High-Temperature Superconductors2014
Author(s)
S. J. Moon, Y. S. Lee, A. A. Schafgans, A. V. Chubukov, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda, M. A. Tanatar, R. Prozorov, A. Thaler, P. C. Canfield, S. L. Bud'ko, A. S. Sefat, D. Mandrus, K. Segawa, Y. Ando, D. N. Basov,
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Journal Title
Phys. Rev. B
Volume: 90
Issue: 1
Pages: 014503-014503
DOI
Related Report
Peer Reviewed
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[Journal Article] Disorder-Induced Topological Change of the Superconducting Gap Structure in Iron Pnictides2014
Author(s)
Y. Mizukami, M. Konczykowski, Y. Kawamoto, S. Kurata, S. Kasahara, K. Hashimoto, V. Mishra, A. Kreisel, Y. Wang, P. J. Hirschfeld, Y. Matsuda, and T. Shibauchi,
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Journal Title
Nat. Commun.
Volume: 5
Issue: 1
Pages: 5657-5657
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Journal Article] Anomalous Critical Fields in Quantum Critical Superconductors2014
Author(s)
C. Putzke, P. Walmsley, J. D. Fletcher, L. Malone, D. Vignolles, C. Proust, S. Badoux, P. See, H. E. Beere, D. A. Ritchie, S. Kasahara, Y. Mizukami, T. Shibauchi, Y. Matsuda, and A. Carrington,
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Journal Title
Nat. Commun.
Volume: 5
Issue: 1
Pages: 5679-5679
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] Infrared Measurement of the Pseudogap of P-Doped and Co-Doped High-T emperature BaFe2As2 Superconductors2012
Author(s)
S. J. Moon, A. A. Schafgans, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda, M. A. Tanatar, R. Prozorov, A. Thaler, P. C. Canfield, A. S. Sefat, D. Mandrus, and D. N. Basov
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Journal Title
Phys. Rev. Lett
Volume: 109
Related Report
Peer Reviewed
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[Presentation] Fine tuning of the quantum criticality in the heavy fermion superlattices CeRhIn 5/YbRhIn 52015
Author(s)
Ryota Endo, Rintaro Toda, Yousuke Hanaoka, Masaaki Shimozawa, Takuya Yamashita, Yusuke Shimoyama, Shigeru Kasahara, Yoshi Tokiwa, Yuichi Kasahara, Takasada Shibauchi, Takahito Terashima, Yuji Matsuda
Organizer
APS March Meeting 2015
Place of Presentation
San Antonio, TX, USA
Year and Date
2015-03-21 – 2015-03-24
Related Report
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[Presentation] Preformed pairing in superconducting FeSe in the BCS-BEC cross-over regime2015
Author(s)
S. Kasahara, Y. Shimoyama, R. Kobayashi, T. Yamashita, T. Watashige, Y. Matsuda, T. Shibauchi, T. Wolf, A. E. Bohmer, F. Hardy, C. Meingast, H. v. Lohneysen
Organizer
APS March Meeting 2015
Place of Presentation
San Antonio, TX, USA
Year and Date
2015-03-02 – 2015-03-06
Related Report
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[Presentation] Friedel oscillations of the superconducting gap in FeSe2015
Author(s)
T. Hanaguri, T. Watashige, Y. Kohsaka, K. Iwaya, T. Machida, T. Shibauchi, R. Kobayashi, S. Kasahara, Y. Matsuda, A. Bohmer, T. Wolf, C. Meingast, H. v. Lohneysen
Organizer
APS March Meeting 2015
Place of Presentation
San Antonio, TX, USA
Year and Date
2015-03-02 – 2015-03-06
Related Report
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[Presentation] Spin fluctuations-corrected DFT for Fe-based superconductors2015
Author(s)
Luciano Ortenzi, Hlynur Gretarsson, S. Kasahara, Y. Matsuda, T. Shibauchi, K.D. Finkelstein, W. Wu, S.R. Julian, Young-June Kim, I.I. Mazin, Lilia Boeri
Organizer
APS March Meeting 2015
Place of Presentation
San Antonio, TX, USA
Year and Date
2015-03-02 – 2015-03-06
Related Report
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[Presentation] Influence of twin boundaries on superconducting gap nodes in FeSe single crystal studied by STM/STS2014
Author(s)
T. Watashige, T. Hanaguri, Y. Kohsaka, K. Iwaya, Y. Fu, S. Kasahara D. Watanabe Y. Mizukami T. Mikami Y. Kawamoto S. Kurata T. Shibauchi Y. Matsuda, A.E. Boehmer, T. Wolf, C. Meingast, H. v. Loehneysen
Organizer
APS March Meeting 2014
Place of Presentation
Denver, Colorado (USA)
Related Report
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[Presentation] Quasi-particle interference and possible orbital order in FeSe2014
Author(s)
T. Hanaguri, T. Watashige, Y. Kohsaka, K. Iwaya, Y. Fu, S. Kasahara D. Watanabe Y. Mizukami T. Mikami Y. Kawamoto S. Kurata T. Shibauchi Y. Matsuda, A.E. Boehmer, T. Wolf, C. Meingast, H. v. Loehneysen
Organizer
APS March Meeting 2014
Place of Presentation
Denver, Colorado (USA)
Related Report
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[Presentation] Anomalous behaviour of critical fields near a superconducting quantum critical point in BaFe2(As1-xPx)22014
Author(s)
C. Putzke, A. Carrington, P. Walmsley, L. Malone, J.D. Fletcher, P. See, D. Vignolles, C. Proust, S. Badoux, S. Kasahara, Y. Mazukami, T. Shibauchi, Y. Matsuda
Organizer
APS March Meeting 2014
Place of Presentation
Denver, Colorado (USA)
Related Report
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[Presentation] Nodal superconducting state in clean single crystals of FeSe2014
Author(s)
S. Kasahara, T. Mikami, Y. Kawamoto, S. Kurata, D. Watanabe, T. Shibauchi, Y. Matsuda, A.E. Boehmer, T. Wolf, C. Meingast, H. v. Loehneysen
Organizer
APS March Meeting 2014
Place of Presentation
Denver, Colorado (USA)
Related Report
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[Presentation] The low temperature Fermi surface of IrTe2 probed by quantum oscillations2014
Author(s)
Samuel Blake, Amalia Coldea, Matthew Watson, Arjun Narayanan, Alix McCollam, Shigeru Kasahara, Takuya Yamashita, Daiki Watanabe, Takasada Shibauchi, Yuji Matsuda, Robert Schoonmaker
Organizer
APS March Meeting 2014
Place of Presentation
Denver, Colorado (USA)
Related Report
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[Presentation] Nematic transition and hidden quantum critical point in BaFe2(As1-xPx)22013
Author(s)
S. Kasanara, K. Hashimoto, H.J. Shi, H. Shishido, Y. Tsuruhara, S. Tonegawa, Y. Mizukami, K. Sugimoto, T. Fukuda, A.H. Nevidomskyy, M. Tanatar, R. Prozorov, A. Carrington, T. Terashima, T. Shibauchi, and Y. Matsuda
Organizer
Japan-China-Korea A3 Foresight Program of "Joint Research on Novel Properties of Complex Oxides" 2013 Tokyo Meeting
Place of Presentation
Koshiba Hall, University of Tokyo、(東京都)
Related Report
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[Presentation] BaFe2(As, P)2における擬ギャップ22013
Author(s)
園部竜也, 下志万貴博, 出田真一郎, 吉田鉄平, 藤森淳, 組頭広志, 小野寛太, 中島陽佑, 安斎太陽, 井野明洋, 有田将司, 生天目博文, 谷口雅樹, 中島正道, 内田慎一, 富岡泰秀, 伊藤利充, 木方邦宏, 李哲虎, 伊豫彰, 永崎洋, 笠原成, 寺嶋孝仁, 芝内孝禎, 松田祐司, 石坂香子
Organizer
日本物理学会第68回年次大会
Place of Presentation
広島大学(広島県)
Related Report
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[Presentation] 熱伝導率測定からみたオーバードープ領域の(Ba1-xKx)Fe2As2における超伝導ギャップ構造2013
Author(s)
渡邊大樹, 山下卓也, 笠原成, 太田卓見, 山下穣, 齊藤拓, 深潭英人, 小堀洋, 石田茂之, 木方邦宏, 伊豫彰, 李哲虎, 永崎洋, Anton B, Vorontsov, 芝内孝禎, 松田祐司
Organizer
日本物理学会第68回年次大会
Place of Presentation
広島大学(広島県)
Related Report
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[Presentation] 磁場侵入長測定からみたオーバードープ領域の(Ba1-xKx)Fe2As2における超伝導ギャップ構造2013
Author(s)
川本雄太, 水上雄太, 蔵田聡信, 笠原成, 齊藤拓, 深潭英人, 小堀洋, 石田茂之, 木方邦宏, 伊豫彰, 李哲虎, 永崎洋, 芝内孝禎, 松田祐司
Organizer
日本物理学会第68回年次大会
Place of Presentation
広島大学(広島県)
Related Report
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[Presentation] 磁場侵入長測定からみたオーバードープ領域の(Ba1-xKx)Fe2 As2における超伝導ギャップ構造2013
Author(s)
川本雄太, 水上雄太, 蔵田聡信, 笠原成, 齊藤拓, 深潭英人, 小堀洋, 石田茂之, 木方邦宏, 伊豫彰, 李哲虎, 永崎洋, 芝内孝禎, 松田祐司
Organizer
日本物理学会第68回年次大会
Place of Presentation
広島大学(広島県)
Related Report
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[Presentation] 電子線照射により不純物散乱を制御したBaFe2(As1-xPx)2における超伝導ギャップ構造の変化2013
Author(s)
水上雄太, 川本雄太, 橋本顕一郎, 笠原成, M. Konczykowski, C. J. van der Beek, B. Boizot, R.Prozorov, Y. Wang, A. Kreisel, P.J. Hirschfeld, V. Mishira, 芝内孝禎,松田祐司
Organizer
日本物理学会第68回年次大会
Place of Presentation
広島大学(広島県)
Related Report
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[Presentation] URu2Si2の隠れた秩序相におけるネマティック電子状態の研究2012
Author(s)
利根川翔,鶴原悠悟,笠原成,岡崎竜二,芳賀芳範,松田達磨,山本悦嗣,大貫惇睦,池田浩章,芝内孝禎,松田祐司
Organizer
日本物理学会 2012年秋季大会
Place of Presentation
横浜国立大学(神奈川県)
Related Report
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[Presentation] 鉄系超伝導体Ba(Fe1-xCox)2As2におけるネマティック秩序相の形成2012
Author(s)
鶴原悠悟,笠原成,利根川翔,水上雄太,渡辺大樹,史宏杰,福田竜生,杉本邦久, A.H.Nevidomskyy,寺嶋孝仁,芝内孝禎,松田祐司
Organizer
日本物理学会 2012年秋季大会
Place of Presentation
横浜国立大学(神奈川県)
Related Report
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[Presentation] (Bal-xKx)Fe2As2のホールドープエンド近傍における超伝導ギャップ構造(熱伝導率測定)2012
Author(s)
山下卓也,渡邊大樹,笠原成,山下穣,芝内孝禎,松田祐司,齊藤拓,深潭英人,小堀洋,木方邦,宏,伊豫彰,李哲虎,永崎洋
Organizer
日本物理学会 2012年秋季大会
Place of Presentation
横浜国立大学(神奈川県)
Related Report
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[Presentation] (Ba1-xKx)Fe2As2のホールドープエンド近傍における超伝導ギャップ構造(磁場侵入長測定)2012
Author(s)
川本雄太,水上雄太, S.K.Goh, 笠原成,芝内孝禎,松田祐司,齊藤拓,深潭英人,小堀洋,木方邦宏,伊豫彰,李哲虎,永崎洋
Organizer
日本物理学会 2012年秋季大会
Place of Presentation
横浜国立大学(神奈川県)
Related Report
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[Presentation] BaFe2(As1-xPx)2(x = 0.38)の超伝導ギャップの異方性2012
Author(s)
出田真一郎,吉田鉄平,鈴木博人,藤森淳,下志万貴博,石坂香子, Walid Malaeb, 辛埴,中島陽祐,安斎太陽,井野明洋,有田将司,生天目博文,谷口樹,組頭広志,小野寛太,笠原成,寺嶋孝仁,芝内孝禎,松田祐司,中島正道,内田慎一,富岡泰秀,伊藤利充,木方邦宏,李哲虎,伊豫彰,永崎洋,池田浩章,有田亮太郎
Organizer
日本物理学会 2012年秋季大会
Place of Presentation
横浜国立大学(神奈川県)
Related Report
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[Presentation] BaFe2(As1-xPx)2のバンド軌道対称性2012
Author(s)
吉田鉄平,出田真一郎,西一郎,鈴木博人,藤森淳,下志万貴博,品田慶,石坂香子, Walid Malaeb,辛埴,中島陽佑,安斎太陽,井野明洋,有田将司,生天目博文,谷口雅樹,組頭広志,小野寛太,笠原成,寺嶋孝仁,芝内孝禎,松田祐司,中島正道,内田慎一,富岡泰秀,伊藤利充,木方邦宏,李哲虎,伊豫彰,永崎洋,池田浩章,有田亮太郎, S.K.Mo, Z.X. Sheii, Z, Hussain
Organizer
日本物理学会 2012年秋季大会
Place of Presentation
横浜国立大学(神奈川県)
Related Report
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[Presentation] BaFe2(As,P)2における擬ギャップ2012
Author(s)
園部竜也,辱志万貴博,品田慶,出田真一郎, Walid Malaeb, 石田行章,辛埴,中島正道,富岡泰秀,木方邦宏,李哲虎,伊豫彰,永崎洋,伊藤利充,内田慎一,吉田鉄平,藤森淳,笠原成,寺嶋孝仁,芝内孝禎,松田祐司,石坂香子
Organizer
日本物理学会 2012年秋季大会
Place of Presentation
横浜国立大学(神奈川県)
Related Report
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[Presentation] LaFeAsOl-yの最適ドーブ試料における磁場侵入長測定から見た超伝導ギャップ構造2012
Author(s)
水上雄太,川本雄太, S.K. Goh, 笠原成,石角元志,石田茂之,鬼頭聖,伊豫彰,永崎洋,社本真一,寺嶋孝仁,芝内孝禎,松田祐司
Organizer
日本物理学会 2012年秋季大会
Place of Presentation
横浜国立大学(神奈川県)
Related Report
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