Structural phase transition, precursory electronic anomaly, and strong-coupling superconductivity in quasi-skutterudite (Sr1-xCax)3Ir4Sn13 and Ca3Rh4Sn13

doi:10.1088/1674-1056/27/7/077401

中国物理B ›› 2018, Vol. 27 ›› Issue (7): 77401-077401.doi: 10.1088/1674-1056/27/7/077401

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

Structural phase transition, precursory electronic anomaly, and strong-coupling superconductivity in quasi-skutterudite (Sr_1-xCa_x)₃Ir₄Sn₁₃ and Ca₃Rh₄Sn₁₃

Jun Luo(罗军), Jie Yang(杨杰), S Maeda, Zheng Li(李政), Guo-Qing Zheng(郑国庆)

1 Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Department of Physics, Okayama University, Okayama 700-8530, Japan

收稿日期:2018-04-09 修回日期:2018-05-02 出版日期:2018-07-05 发布日期:2018-07-05
通讯作者: Jie Yang, Guo-Qing Zheng E-mail:yangjie@iphy.ac.cn;gqzheng123@gmail.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11674377 and 11634015), the National Key R&D Program of China (Grant Nos. 2017YFA0302904 and 2016YFA0300502), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB07020200). J. Y. is supported by the Youth Innovation Promotion Association of CAS.

Structural phase transition, precursory electronic anomaly, and strong-coupling superconductivity in quasi-skutterudite (Sr_1-xCa_x)₃Ir₄Sn₁₃ and Ca₃Rh₄Sn₁₃

Jun Luo(罗军)^1,2, Jie Yang(杨杰)¹, S Maeda³, Zheng Li(李政)^1,2, Guo-Qing Zheng(郑国庆)^1,2,3

1 Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Department of Physics, Okayama University, Okayama 700-8530, Japan

Received:2018-04-09 Revised:2018-05-02 Online:2018-07-05 Published:2018-07-05
Contact: Jie Yang, Guo-Qing Zheng E-mail:yangjie@iphy.ac.cn;gqzheng123@gmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11674377 and 11634015), the National Key R&D Program of China (Grant Nos. 2017YFA0302904 and 2016YFA0300502), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB07020200). J. Y. is supported by the Youth Innovation Promotion Association of CAS.

摘要/Abstract

摘要：

The interplay between superconductivity and structural phase transition has attracted enormous interest in recent years. For example, in Fe-pnictide high temperature superconductors, quantum fluctuations in association with structural phase transition have been proposed to lead to many novel physical properties and even the superconductivity itself. Here we report a finding that the quasi-skutterudite superconductors (Sr_1-xCa_x)₃Ir₄Sn₁₃ (x=0, 0.5, 1) and Ca₃Rh₄Sn₁₃ show some unusual properties similar to the Fe-pnictides, through ¹¹⁹Sn nuclear magnetic resonance (NMR) measurements. In (Sr_1-xCa_x)₃Ir₄Sn₁₃, the NMR linewidth increases below a temperature T^* that is higher than the structural phase transition temperature T_s. The spin-lattice relaxation rate (1/T₁) divided by temperature (T), 1/T₁T and the Knight shift K increase with decreasing T down to T^*, but start to decrease below T^*, and followed by more distinct changes at T_s. In contrast, none of the anomalies is observed in Ca₃Rh₄Sn₁₃ that does not undergo a structural phase transition. The precursory phenomenon above the structural phase transition resembles that occurring in Fe-pnictides. In the superconducting state of Ca₃Ir₄Sn₁₃, 1/T₁ decays as exp(-△/k_BT) with a large gap △=2.21 k_BT_c, yet without a Hebel-Slichter coherence peak, which indicates strong-coupling superconductivity. Our results provide new insight into the relationship between superconductivity and the electronic-structure change associated with structural phase transition.

关键词: nuclear magnetic resonance, antiferromagnetic fluctuation, structural phase transition, phase diagram

Abstract:

Key words: nuclear magnetic resonance, antiferromagnetic fluctuation, structural phase transition, phase diagram

中图分类号: (Nuclear magnetic resonance)

74.25.nj

74.40.-n (Fluctuation phenomena) 74.25.Dw (Superconductivity phase diagrams)

罗军, 杨杰, S Maeda, 李政, 郑国庆. Structural phase transition, precursory electronic anomaly, and strong-coupling superconductivity in quasi-skutterudite (Sr_1-xCa_x)₃Ir₄Sn₁₃ and Ca₃Rh₄Sn₁₃[J]. 中国物理B, 2018, 27(7): 77401-077401.

Jun Luo(罗军), Jie Yang(杨杰), S Maeda, Zheng Li(李政), Guo-Qing Zheng(郑国庆). Structural phase transition, precursory electronic anomaly, and strong-coupling superconductivity in quasi-skutterudite (Sr_1-xCa_x)₃Ir₄Sn₁₃ and Ca₃Rh₄Sn₁₃[J]. Chin. Phys. B, 2018, 27(7): 77401-077401.

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Structural phase transition, precursory electronic anomaly, and strong-coupling superconductivity in quasi-skutterudite (Sr_1-xCa_x)₃Ir₄Sn₁₃ and Ca₃Rh₄Sn₁₃

Structural phase transition, precursory electronic anomaly, and strong-coupling superconductivity in quasi-skutterudite (Sr_1-xCa_x)₃Ir₄Sn₁₃ and Ca₃Rh₄Sn₁₃

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