Tuning quantum critical points by impurity scattering seen via specific heat measurements

• Project/Area Number: 15K17692
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: Mizukami Yuta 東京大学, 大学院新領域創成科学研究科, 助教 (80734095)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2015: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 鉄系超伝導 / 重い電子系超伝導 / 反強磁性秩序 / 電子ネマティック秩序 / 量子臨界点 / 精密比熱測定 / 電子線照射 / 元素置換効果 / 鉄系超伝導体 / 重い電子系超伝導体 / 不純物効果 / 反強磁性相 / 異方的超伝導 / 比熱測定

Outline of Final Research Achievements

In strongly correlated electron system, anomalous physical properties and exotic superconductivity often emerge near the quantum critical point(QCP) of ordered phase such as magnetic order, orbital order, and charge order. By using electron irradiation, we have observed synchronized shifts of magnetic QCP and high-temperature superconducting phase in iron-pnictide superconductors, suggesting the QCP may enhance superconductivity. In heavy-fermion superconductor CeCu2Si2, a prototypical superconductor which emerges near the magnetic QCP, we have suggested exotic mechanism through the systematic study using electron irradiation. In iron-chalcogenide FeSe, we have suppressed the orbital order by S substitution. Our studies have revealed that the superconducting state abruptly changes across the orbital QCP.

Research Products

• [Int'l Joint Research] Ecole Polytechnique(France)
• [Int'l Joint Research] The Chinese University of Hong Kong/Chinese Academy of Sciences(China)
• [Int'l Joint Research] University of Bristol(英国)
• [Int'l Joint Research] MPI for Chemical Physics of Solids/Institute for Solid State Physics/Augsburg University(Germany)
• [Int'l Joint Research] Ecole Polytechnique(France)
• [Int'l Joint Research] Karlsruhe Institute of Technology(Germany)
• [Int'l Joint Research] Chinese Academy of Sciences/Yunnan University(China)
• [Int'l Joint Research] Oak Ridge National Laboratory/University of Tennessee(米国)
• [Int'l Joint Research] Ecole Polytechnique(France)
• [Journal Article] Maximizing Tc by tuning nematicity and magnetism in FeSe1x Sx superconductors (2017)
  • Author(s): Matsuura K.、Mizukami Y.、Arai Y.、Sugimura Y.、Maejima N.、Machida A.、Watanuki T.、Fukuda T.、Yajima T.、Hiroi Z.、Yip K. Y.、Chan Y. C.、Niu Q.、Hosoi S.、Ishida K.、Mukasa K.、Kasahara S.、Cheng J.-G.、Goh S. K.、Matsuda Y.、Uwatoko Y.、Shibauchi T.
  • Journal Title: Nature Communications Volume: 8 Issue: 1 Pages: 1143-1143
  • DOI: 10.1038/s41467-017-01277-x
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Full-Gap Superconductivity Robust against Disorder in Heavy-Fermion CeCu2Si2 (2017)
  • Author(s): Takenaka T.、Mizukami Y.、Wilcox J.A.、Konczykowski M.、Seiro S.、Geibel C.、Tokiwa Y.、Kasahara Y.、Putzke C.、Matsuda Y.、Carrington A.、Shibauchi T.
  • Journal Title: Physical Review Letters Volume: 119 Issue: 7 Pages: 077001-077001
  • DOI: 10.1103/physrevlett.119.077001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Weakening of the diamagnetic shielding in FeSe1?xSx at high pressures (2017)
  • Author(s): Yip K. Y.、Chan Y. C.、Niu Q.、Matsuura K.、Mizukami Y.、Kasahara S.、Matsuda Y.、Shibauchi T.、Goh Swee K.
  • Journal Title: Physical Review B Volume: 96 Issue: 2
  • DOI: 10.1103/physrevb.96.020502
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Impact of Disorder on the Superconducting Phase Diagram in BaFe2(As1-xPx)2 (2017)
  • Author(s): Y. Mizukami, M. Konczykowski, K. Matsuura, T. Watashige, S. Kasahara, Y. Matsuda, and T. Shibauchi
  • Journal Title: J. Phys. Soc. Jpn. Volume: 86 Issue: 8 Pages: 083706-083706
  • DOI: 10.7566/jpsj.86.083706
  • NAID: 210000134466
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2 (2017)
  • Author(s): T. Yamashita, T. Takenaka, Y. Tokiwa, J. A. Wilcox, Y. Mizukami, D. Terazawa, Y. Kasahara, S. Kittaka, T. Sakakibara, M. Konczykowski, S. Seiro, H. S. Jeevan, C. Geibel, C. Putzke, T. Onishi, H. Ikeda, A. Carrington, T. Shibauchi, Y. Matsuda
  • Journal Title: Science Advances Volume: 3 Issue: 6 Pages: 1601667-1601667
  • DOI: 10.1126/sciadv.1601667
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Nematic Quantum Critical Point without Magnetism in FeSe1-xSx Superconductors (2016)
  • Author(s): S. Hosoi, K. Matsuura, K. Ishida, H. Wang, Y. Mizukami, T. Watashige, S. Kasahara, Y. Matsuda, and T. Shibauchi
  • Journal Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 113 Issue: 29 Pages: 8139-8143
  • DOI: 10.1073/pnas.1605806113
  • NAID: 120006347247
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Evolution of Quasiparticle Excitations with Enhanced Electron Correlations in Superconducting AFe2As2 (A = K, Rb, and Cs (2016)
  • Author(s): Y. Mizukami, Y. Kawamoto, Y. Shimoyama, S. Kurata, H. Ikeda, T. Wolf, D. A. Zocco, K. Grube, H. v. Lohneysen, Y. Matsuda, and T. Shibauchi
  • Journal Title: Physical Review B Volume: 94 Issue: 2 Pages: 024508-024508
  • DOI: 10.1103/physrevb.94.024508
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe (2016)
  • Author(s): J. P. Sun, K. Matsuura, G. Z. Ye, Y. Mizukami, M. Shimozawa, K. Matsubayashi, M. Yamashita, T. Watashige, S. Kasahara, Y. Matsuda, J.-Q. Yan, B. C. Sales, Y. Uwatoko, J.-G. Cheng, and T. Shibauch
  • Journal Title: Nature Communication Volume: 7 Issue: 1 Pages: 12146-12146
  • DOI: 10.1038/ncomms12146
  • NAID: 120006335661
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] 軌道選択モット転移近傍に位置するAFe2As2(A=Rb,Cs)の異常物性 (2018)
  • Author(s): 水上雄太
  • Organizer: つくば-柏-本郷 超伝導かけはしプロジェクト ワークショップ（１）
• [Presentation] Fe(Se,S)の正方晶相における超伝導状態の比熱測定 (2018)
  • Author(s): 水上雄太, 田中桜平, 松浦康平, 王浩, 谷口智哉, 綿重達哉, 笠原成, 笠原裕一, 松田祐司, 芝内孝禎
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] Evolution of specific heat with controlled disorder in filled skutterudite superconductor LaRu4As12 (2018)
  • Author(s): Yuta Mizukami, Ohei Tanaka, Marcin Konczykowski, Satoshi Kurata, Yuji Matsuda, Zygmunt Henkie, Tomasz Cichorek, Takasada Shibauchi
  • Organizer: American Physical Society March meeting 2018
  • Int'l Joint Research
• [Presentation] 新型超伝導体NaSn2As2の磁場侵入長測定 (2018)
  • Author(s): 石原滉大, 竹中崇了, 水上雄太, 後藤陽介, 水口佳一, 芝内孝禎
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] 銅を含む配位高分子[Cu3(C6S6)]nにおける超伝導 (2018)
  • Author(s): 竹中崇了, 石原滉大, 水上雄太, Xing Huang, Wei Xu, Daoben Zhu, Jinguang Cheng, 芝内孝禎
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] 細井優, 石田浩祐, 水上雄太, 今泉聖司, 橋詰和樹, 青山拓也, 今井良宗, 大串研也, 芝内孝禎 (2018)
  • Author(s): 鉄系梯子型化合物BaFe2S3における弾性抵抗測定
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] Nematic quantum-critical fluctuations near the pseudogap critical point in high-Tc cuprate superconductors (2018)
  • Author(s): Kousuke Ishida, Suguru Hosoi, Yuki Teramoto, Tomohiro Usui, Yuta Mizukami, Kenji Itaka, Yuji Matsuda, Takao Watanabe, Takasada Shibauchi
  • Organizer: American Physical Society March meeting 2018
  • Int'l Joint Research
• [Presentation] Orbital ordering in the iron-ladder material BaFe2S3 studied by elastoresistance measurements (2018)
  • Author(s): Suguru Hosoi, Kousuke Ishida, Yuta Mizukami, Satoshi Imaizumi, Kazuki Hashizume, Takuya Aoyama, Yoshinori Imai, Kenya Ohgushi, Takasada Shibauchi
  • Organizer: American Physical Society March meeting 2018
  • Int'l Joint Research
• [Presentation] Fe(Se,S)純良単結晶における高圧下X線回折 (2017)
  • Author(s): 水上雄太
  • Organizer: 日本物理学会 第72回年次大会
  • Place of Presentation: 大阪大学
  • Year and Date: 2017-03-17
• [Presentation] 電子線照射を用いた不純物効果による鉄系超伝導体の超伝導対称性決定 (2017)
  • Author(s): 水上雄太
  • Organizer: 高温超伝導フォーラム第5回研究会
  • Invited
• [Presentation] Quantum critical points in iron-based superconductors (2017)
  • Author(s): Y. Mizukami
  • Organizer: Superstripes 2017
  • Int'l Joint Research / Invited
• [Presentation] 過剰ホールドープされた鉄系超伝導体AFe2As2(A=Rb,Cs)における精密比熱、磁化測定 (2017)
  • Author(s): 水上雄太, 田中桜平, 石田浩祐, Thomas Wolf, Kai Grube, Hilbert von Loehneysen, 芝内孝禎
  • Organizer: 日本物理学会 2017年秋季大会
• [Presentation] 充填スクッテルダイト超伝導体LaRu4As12における電子線照射の影響 (2017)
  • Author(s): 田中桜平, 水上雄太, Marcin Konczykowski, 藏田聡信, 松浦康平, 川本雄太, Zygmunt Henkie, Tomasz Cichorek, 松田祐司, 芝内孝禎
  • Organizer: 日本物理学会 2017年秋季大会
• [Presentation] AFe2As2(A= Rb, Cs)におけるネマティック揺らぎの測定 (2017)
  • Author(s): 石田浩祐, 細井優, 水上雄太, Thomas Wolf, Kai Grube, Hilbert von Loehneysen, 芝内孝禎
  • Organizer: 日本物理学会 2017年秋季大会
• [Presentation] 鉄系超伝導体FeSe1-xSxの温度・圧力・化学置換の三次元電子相図 (2017)
  • Author(s): 杉村優一, 松浦康平, 新井佑基, 向笠清隆, 水上雄太, 綿重達哉, 笠原成, 松田祐司, 上床美也, 芝内孝禎
  • Organizer: 日本物理学会 2017年秋季大会
• [Presentation] Fe(Se,S)純良単結晶における電子線照射による影響 (2016)
  • Author(s): 水上雄太
  • Organizer: 日本物理学会 2016年秋季大会
  • Place of Presentation: 金沢大学
  • Year and Date: 2016-09-13
• [Presentation] High-pressure study on high-quality single-crystalline FeSe (2016)
  • Author(s): Y. Mizukami
  • Organizer: EMN Prague meeting
  • Place of Presentation: Prague, Czech
  • Year and Date: 2016-06-21
  • Int'l Joint Research / Invited
• [Presentation] Effect of electron irradiation in iron pnictides (2016)
  • Author(s): Y. Mizukami
  • Organizer: EMN Croatia meeting
  • Place of Presentation: Dubrovnik, Croatia
  • Year and Date: 2016-05-04
  • Int'l Joint Research / Invited
• [Presentation] 極低温磁場侵入長測定と不純物効果から見た重い電子系超伝導体CeCu2Si2のギャップ構造 (2016)
  • Author(s): 竹中崇了, 水上雄太, 新井佑基, J. Wilcox, C. Putzke, A. Carrington, S. Seiro, H. S. Jeevan, C. Geibel, M. Konczykowski, 常盤欣文, 松田祐司, 芝内孝禎
  • Organizer: 日本物理学会 第71回年次大会
  • Place of Presentation: 東北学院大学
  • Year and Date: 2016-03-19
• [Presentation] FeSe純良単結晶における高圧下電気抵抗率測定 (2016)
  • Author(s): 松浦康平, 水上雄太, 下澤雅明, 松林和幸, 山下穣, 上床美也, 綿重達哉, 笠原成, J. P. Sun, G. Z. Ye, J. Q. Yan, J.-G. Cheng, 松田祐司, 芝内孝禎
  • Organizer: 日本物理学会 第71回年次大会
  • Place of Presentation: 東北学院大学
  • Year and Date: 2016-03-19
• [Presentation] FeSe純良単結晶における高圧下X線回折 (2016)
  • Author(s): 水上雄太, 松浦康平, 細井優, 綿重達哉, 笠原成, 前島尚行, 町田晃彦, 綿貫徹, 福田竜生, 松田祐司, 芝内孝禎
  • Organizer: 日本物理学会 第71回年次大会
  • Place of Presentation: 東北学院大学
  • Year and Date: 2016-03-19
• [Presentation] A shift of the phase diagram in BaFe2(As1-xPx)2 by controlled disorder (2016)
  • Author(s): Y.Mizukami, K.Matsuura, M.Konczykowski, T.Watashige, S.Kasahara, Y.Matsuda, and T.Shibauchi
  • Organizer: American Physical Society March meeting 2016
  • Place of Presentation: Baltimore, Maryland, USA
  • Year and Date: 2016-03-14
  • Int'l Joint Research
• [Presentation] ematic quantum criticality in FeSe1-xSx revealed by elastoresistance measurements (2016)
  • Author(s): S.Hosoi, K.Matsuura, K.Ishida, H.Wang, Y.Mizukami, T.Watashige, S.Kasahara, Y.Matsuda, and T.Shibauchi
  • Organizer: American Physical Society March meeting 2016
  • Place of Presentation: Baltimore, Maryland, USA
  • Year and Date: 2016-03-14
• [Presentation] 重い電子系超伝導体CeCu2Si2における磁場侵入長測定 (2015)
  • Author(s): 竹中崇了, 水上雄太, H. S. Jeevan, C. Geibel, M. Konczykowski, 芝内孝禎
  • 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
• [Presentation] 電子線照射により制御した不純物散乱の量子臨界点と超伝導相への影響 (2015)
  • Author(s): 水上雄太, 松浦康平, M. Konczykowski, 綿重達哉, 笠原成, 松田祐司, 芝内孝禎
  • 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
• [Presentation] 鉄系超伝導体Fe(Se, S)におけるネマティック感受率測定 (2015)
  • Author(s): 細井優, 蔵田聡信, 河智史朗, 水上雄太, 綿重達哉, 笠原成, 徳永将史, 松田裕司, 芝内孝禎
  • 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
• [Presentation] 鉄系超伝導体FeSeにおける圧力下電子相図 (2015)
  • Author(s): 松浦康平, 水上雄太, 下澤雅明, 松林和幸, 山下穣, 上床美也, T. Wolf, H. v. Lohneysen, 綿重達哉, 笠原成, 松田祐司, 芝内孝禎
  • 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
• [Presentation] Effect of electron irradiation on the superconducting gap structure in iron pnictides (2015)
  • Author(s): Yuta Mizukami
  • Organizer: ELECTRON CORRELATION IN NANOSTRUCTURES (ECN-2015)
  • Place of Presentation: Odessa, Ukraine
  • Year and Date: 2015-09-02
  • Int'l Joint Research / Invited
• [Presentation] Effect of electron irradiation on the superconducting gap structure in iron pnictides (2015)
  • Author(s): Yuta Mizukami
  • Organizer: 11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE 2015)
  • Place of Presentation: Vancouver, Canada
  • Year and Date: 2015-06-14
  • Int'l Joint Research / Invited
• [Remarks] 物理的圧力と化学的圧力の組み合わせにより、新しい鉄系高温超伝導を発見
  • URL: http://www.k.u-tokyo.ac.jp/info/entry/22_entry603/
• [Remarks] レアアース化合物における新奇な超伝導機構
  • URL: http://www.k.u-tokyo.ac.jp/info/entry/22_entry594/
• [Remarks] 38年を経て明らかになった 非従来型超伝導の「先駆け」物質の電子状態
  • URL: http://www.k.u-tokyo.ac.jp/info/entry/22_entry576/
• [Remarks] Shibauchi Laboratory Publications
  • URL: http://qpm.k.u-tokyo.ac.jp/index.php?Publications