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Chin. Phys. B, 2018, Vol. 27(7): 077401    DOI: 10.1088/1674-1056/27/7/077401
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Structural phase transition, precursory electronic anomaly, and strong-coupling superconductivity in quasi-skutterudite (Sr1-xCax)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
Abstract  

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 (Sr1-xCax)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 (Sr1-xCax)3Ir4Sn13, the NMR linewidth increases below a temperature T* that is higher than the structural phase transition temperature Ts. 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 Ts. 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(-/kBT) with a large gap =2.21 kBTc, 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.

Keywords:  nuclear magnetic resonance      antiferromagnetic fluctuation      structural phase transition      phase diagram  
Received:  09 April 2018      Revised:  02 May 2018      Accepted manuscript online: 
PACS:  74.25.nj (Nuclear magnetic resonance)  
  74.40.-n (Fluctuation phenomena)  
  74.25.Dw (Superconductivity phase diagrams)  
Fund: 

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.

Corresponding Authors:  Jie Yang, Guo-Qing Zheng     E-mail:  yangjie@iphy.ac.cn;gqzheng123@gmail.com

Cite this article: 

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 (Sr1-xCax)3Ir4Sn13 and Ca3Rh4Sn13 2018 Chin. Phys. B 27 077401

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