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タイトル: | 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 |
著者名の別形: | 芝内, 孝禎 |
キーワード: | superfluid stiffness d-wave superconductivity spin fluctuations mass enhancement quasiparticle scattering |
発行日: | 12-Feb-2013 |
出版者: | National Academy of Sciences |
誌名: | Proceedings of the National Academy of Sciences of the United States of America |
巻: | 110 |
号: | 9 |
開始ページ: | 3293 |
終了ページ: | 3297 |
抄録: | When a second-order magnetic phase transition is tuned to zero temperature by a nonthermal parameter, quantum fluctuations are critically enhanced, often leading to the emergence of unconventional superconductivity. In these "quantum critical" superconductors it has been widely reported that the normal-state properties above the superconducting transition temperature Tc often exhibit anomalous non-Fermi liquid behaviors and enhanced electron correlations. However, the effect of these strong critical fluctuations on the superconducting condensate below Tc is less well established. Here we report measurements of the magnetic penetration depth in heavy-fermion, iron-pnictide, and organic superconductors located close to antiferromagnetic quantum critical points, showing that the superfluid density in these nodal superconductors universally exhibits, unlike the expected T-linear dependence, an anomalous 3/2 power-law temperature dependence over a wide temperature range. We propose that this noninteger power law can be explained if a strong renormalization of effective Fermi velocity due to quantum fluctuations occurs only for momenta k close to the nodes in the superconducting energy gap Δ(k). We suggest that such "nodal criticality" may have an impact on low-energy properties of quantum critical superconductors. |
記述: | 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. |
著作権等: | ©2013 by the National Academy of Sciences This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/169766 |
DOI(出版社版): | 10.1073/pnas.1221976110 |
PubMed ID: | 23404698 |
関連リンク: | https://www.kyoto-u.ac.jp/static/ja/news_data/h/h1/news6/2012/130212_1.htm |
出現コレクション: | 学術雑誌掲載論文等 |
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