Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe4As4

被引：57

作者：

Cho, Kyuil ^{[1
,2
]}

Fente, A. ^{[3
]}

Teknowijoyo, S. ^{[1
,2
]}

Tanatar, M. A. ^{[1
,2
]}

Joshi, K. R. ^{[1
,2
]}

Nusran, N. M. ^{[1
,2
]}

Kong, T. ^{[1
,2
]}

Meier, W. R. ^{[1
,2
]}

Kaluarachchi, U. ^{[1
,2
]}

Guillamon, I. ^{[3
]}

Suderow, H. ^{[3
]}

Bud'ko, S. L. ^{[1
,2
]}

Canfield, P. C. ^{[1
,2
]}

Prozorov, R. ^{[1
,2
]}

机构：

[1] Ames Lab, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[3] Univ Autonoma Madrid, Lab Bajas Temp, Unidad Asociada UAM CSIC, Dept Fis Mat Condensada,Inst Nicolas Cabrera & Co, E-28049 Madrid, Spain

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 10期

基金：

欧盟地平线“2020”;

关键词：

SCANNING TUNNELING SPECTROSCOPY; HIGH-TEMPERATURE SUPERCONDUCTIVITY; PENETRATION DEPTH;

D O I：

10.1103/PhysRevB.95.100502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Measurements of the London penetration depth Delta lambda(T) and tunneling conductance in single crystals of the recently discovered stoichiometric iron-based superconductor CaKFe4As4 (CaK1144) show nodeless, two-effective-gap superconductivity with a larger gap of about 6-10 meV and a smaller gap of about 1-4 meV. Having a critical temperature T-c,T-onset approximate to 35.8 K, this material behaves similar to slightly overdoped (Ba1-x K-x) Fe2As2 (e.g., x = 0.54, T-c approximate to 34 K), a known multigap s(+/-) superconductor. We conclude that the superconducting behavior of stoichiometric CaK1144 demonstrates that two-gap s(perpendicular to) superconductivity is an essential property of high-temperature superconductivity in iron-based superconductors, independent of the degree of substitutional disorder.

引用

页数：5

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