Two-gap superconductivity with line nodes in CsCa2Fe4As4F2

Article

关键词: PENETRATION-DEPTH;    CUPRATE;    MUONS;   

DOI  :  10.1103/PhysRevB.97.060506

来源: SCIE

【 摘 要 】

We report the results of a muon-spin rotation (mu SR) experiment to determine the superconducting ground state of the iron-based superconductor CsCa2Fe4As4F2 with T-c approximate to 28.3 K. This compound is related to the fully gapped superconductor CaCsFe4As4, but here the Ca-containing spacer layer is replaced with one containing Ca2F2. The temperature evolution of the penetration depth strongly suggests the presence of line nodes and is best modeled by a system consisting of both an s-and a d-wave gap. We also find a potentially magnetic phase which appears below approximate to 10 K but does not appear to compete with the superconductivity. This compound contains the largest alkali atom in this family of superconductors, and our results yield a value for the in-plane penetration depth of lambda(ab) (T = 0) = 244(3) nm.

【 授权许可】

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