Large elastic anomalies and strong electron-lattice coupling in iron-based superconductor Ba(Fe_{1鈭?span style='font-style: italic'>x}Co_x)₂As₂

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• 作者：Masahito Yoshizawa^a ; ^d ; ^{yosizawa@iwate-u.ac.jp} ; Shalamujiang Simayi^a ; ^d ; Kohei Sakano^a ; Yoshiki Nakanishi^a ; ^d ; Kunihiro Kihou^b ; ^d ; Chul-Ho Lee^b ; ^d ; Akira Iyo^b ; ^d ; Hiroshi Eisaki^b ; ^d ; Masamichi Nakajima^c ; ^d ; Shin-ichi Uchida^c ; ^d
• 关键词：A. Iron-based superconductor ; C. Elastic constant ; C. Electron-lattice coupling ; D. Quantum criticality
• 刊名：Solid State Communications
• 出版年：2012
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：April, 2012
• 卷：152
• 期：8
• 页码：680-687
• 文件大小：1276 K

摘要

We investigated the elastic properties of the iron-based superconductor Ba(Fe_1鈭?em>xCo_x)₂As₂ with various Co concentrations. The elastic constant shows remarkable anomalies associated with the structural phase transition and the superconducting transition. The elastic constant shows a quantum critical behavior, which behaves just like the magnetic susceptibility of unconventional superconductors. It was suggested that the anomalous part in the elastic compliance is closely related the emergence of superconductivity. Large Gr眉neisen parameter was found at the superconducting transition in the longitudinal elastic constant. These results show the strong electron-lattice coupling in this system, and support the prevailing scenario on the relevant role of structural fluctuation coupling to orbitals to understand a whole picture of iron-based superconductor.