Unconventional London Penetration Depth in Single-Crystal Ba(Fe0.93Co0.07)2As2 Superconductors

被引：143

作者：

Gordon, R. T.

Ni, N.

Martin, C.

Tanatar, M. A.

Vannette, M. D.

Kim, H.

Samolyuk, G. D.

Schmalian, J.

Nandi, S.

Kreyssig, A.

Goldman, A. I.

Yan, J. Q.

Bud'ko, S. L.

Canfield, P. C.

Prozorov, R. ^{[1
]}

机构：

[1] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 12期

关键词：

LAYERED SUPERCONDUCTOR; GAP;

D O I：

10.1103/PhysRevLett.102.127004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The London penetration depth lambda(T) has been measured in single crystals of Ba(Fe0.93Co0.07)(2)As-2. The observed low-temperature variation of lambda(T) follows a power law, Delta lambda(T)similar to T-n with n approximate to 2.4 +/- 0.1, indicating the existence of normal quasiparticles down to at least 0.02T(c). This is in contrast with previous penetration depth measurements on single crystals of NdFeAsO1-xFx and SmFeAsO1-xFx, which indicate an anisotropic but nodeless gap. We discuss possible explanations of the observed power law behavior.

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页数：4

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