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3 0 0 0 IR Nematic quantum critical point without magnetism in FeSe1−xSx superconductors

著者
Hosoi Suguru Matsuura Kohei Ishida Kousuke Wang Hao Mizukami Yuta Watashige Tatsuya Kasahara Shigeru Matsuda Yuji Shibauchi Takasada
出版者
National Academy of Sciences
雑誌
Proceedings of the National Academy of Sciences of the United States of America Online Edition (ISSN:10916490)
巻号頁・発行日
2016-07-05
被引用文献数
165
In most unconventional superconductors, the importance of antifer- romagnetic fluctuations is widely acknowledged. In addition, cuprate and iron-pnictide high-temperature superconductors often exhibit unidirectional (nematic) electronic correlations, including stripe and orbital orders, whose fluctuations may also play a key role for elec- tron pairing. In these materials, however, such nematic correlations are intertwined with antiferromagnetic or charge orders, preventing us to identify the essential role of nematic fluctuations. This calls for new materials having only nematicity without competing or co- existing orders. Here we report systematic elastoresistance mea- surements in FeSe1−xSx superconductors, which, unlike other iron- based families, exhibit an electronic nematic order without accom- panying antiferromagnetic order. We find that the nematic transition temperature decreases with sulfur content x, whereas the nematic fluctuations are strongly enhanced. Near x 0.17, the nematic sus- ceptibility diverges towards absolute zero, revealing a nematic quan- tum critical point. The obtained phase diagram for the nematic and superconducting states highlights FeSe1−xSx as a unique nonmag- netic system suitable for studying the impact of nematicity on super- conductivity.UTokyo Research掲載「新しい種類の超伝導の発生源になりうるか?」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/discovery-may-point-to-new-source-of-superconductivity.htmlUTokyo Research "Discovery may point to new source of superconductivity" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/discovery-may-point-to-new-source-of-superconductivity.html

2 0 0 0 OA Anomalous superfluid density in quantum critical superconductors

著者
Hashimoto Kenichiro Mizukami Yuta Katsumata Ryo Shishido Hiroaki Yamashita Minoru Ikeda Hiroaki Matsuda Yuji Schlueter John A. Fletcher Jonathan D. Carrington Antony Gnida Daniel Kaczorowski Dariusz Shibauchi Takasada
出版者
National Academy of Sciences
雑誌
Proceedings of the National Academy of Sciences of the United States of America (ISSN:00278424)
巻号頁・発行日
2013-02-12
被引用文献数
26
絶対零度の量子ゆらぎにより重くなる超伝導電子 -電子が特定の方向で重くなる異常な現象を発見-. 京都大学プレスリリース. 2013-02-12.