Pauli-Limited Multiband Superconductivity in KFe2As2

被引：78

作者：

Zocco, D. A. ^{[1
]}

Grube, K. ^{[1
]}

Eilers, F. ^{[1
]}

Wolf, T. ^{[1
]}

v Loehneysen, H. ^{[1
,2
]}

机构：

[1] Karlsruhe Inst Technol, Inst Solid State Phys IFP, D-76021 Karlsruhe, Germany

[2] Karlsruhe Inst Technol, Inst Phys, D-76031 Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 05期

关键词：

CRITICAL-FIELD; PURITY DEPENDENCE; TEMPERATURE; SPIN;

D O I：

10.1103/PhysRevLett.111.057007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The upper critical field H-c2(T) of the multiband superconductor KFe2As2 has been studied via low-temperature thermal expansion and magnetostriction measurements. We present compelling evidence for Pauli-limiting effects dominating H-c2(T) for H parallel to a, as revealed by a crossover from second- to first-order phase transitions to the superconducting state in the magnetostriction measurements down to 50 mK. Corresponding features were absent for H parallel to c. To our knowledge, this crossover constitutes the first confirmation of Pauli limiting of the H-c2(T) of a multiband superconductor. The results are supported by modeling Pauli limits for single-band and multiband cases.

引用

页数：5

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