Fully-gapped superconductivity in Ba0.55K0.45Fe1.95Co0.05As2: A low-temperature specific heat study

被引：4

作者：

Gofryk, K. ^{[1
]}

Lashley, J. C. ^{[1
]}

Ronning, F. ^{[1
]}

Safarik, D. J. ^{[1
]}

Weickert, F. ^{[1
]}

Smith, J. L. ^{[1
]}

Leithe-Jasper, A. ^{[2
]}

Schnelle, W. ^{[2
]}

Nicklas, M. ^{[2
]}

Rosner, H. ^{[2
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 22期

关键词：

CRITICAL-FIELD; PURITY DEPENDENCE; PAIRING SYMMETRY; WAVE; STATES; SPIN;

D O I：

10.1103/PhysRevB.85.224504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the Fe-based superconductor Ba0.55K0.45Fe1.95Co0.05As2 in order to identify the structure of the order parameter in this system by performing extensive low-temperature specific heat measurements in zero and in applied magnetic field. The pronounced superconducting jump at T-c = 32.5 K and Delta(0)/(k(B)T(c)) = 2.57 indicate strong-coupling superconductivity in this material. Here we provide evidence for fully gapped superconductivity in Ba0.55K0.45Fe1.95Co0.05As2. A linear magnetic field dependence of the low-temperature specific heat points to s-wave symmetry of the order parameter. Below T-c the superconducting electronic part of the specific heat can be described by the BCS alpha model with Lambda(0) = 7.2 meV.

引用

页数：5

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