Microscopic study of the superconducting state of the iron pnictide RbFe2As2 via muon spin rotation

Article

关键词: PENETRATION DEPTH;    ARSENIDES;    MGB2;   

DOI  :  10.1103/PhysRevB.82.144527

来源: SCIE

【 摘 要 】

A study of the temperature and field dependence of the penetration depth lambda of the superconductor RbFe2As2(T-c = 2.52 K) was carried out by means of muon-spin rotation measurements. In addition to the zero-temperature value of the penetration depth lambda(0) = 267(5) nm, a determination of the upper critical field B-c2(0) = 2.6(2) T was obtained. The temperature dependence of the superconducting carrier concentration is discussed within the framework of a multigap scenario. Compared to the other 122 systems which exhibit much higher Fermi level, a strong reduction in the large gap BCS ratio 2 Delta/k(B)T(c) is observed. This is interpreted as a consequence of the absence of interband processes. Indications of possible pair-breaking effect are also discussed.

【 授权许可】

Free