Two energy gaps in superconducting Lu2Fe3Si5 single crystal derived from the temperature dependence of lower critical field Hc1(T)

被引：3

作者：

Ge, J. ^{[1
]}

Gutierrez, J. ^{[1
]}

Raes, B. ^{[1
]}

Watanabe, T. ^{[2
]}

Koshio, J. ^{[2
]}

Moshchalkov, V. V. ^{[1
]}

机构：

[1] Katholieke Univ Leuven, INPAC, B-3001 Louvain, Belgium

[2] Nihon Univ, Coll Sci & Technol, Dept Phys, Chiyoda Ku, Tokyo 1018308, Japan

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2012年 / 478卷

关键词：

Lower critical field; Penetration depth; Two-gap superconductors; PENETRATION-DEPTH; PHASE; HEAT;

D O I：

10.1016/j.physc.2012.03.001

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a detailed study of in-plane lower critical field H-c1(T) and penetration depth lambda(ab)(T) of the Lu2Fe3Si5 superconductor. Two pronounced changes of the H-c1 curvature are observed on the H-c1(T) curve around 0.4T(c) and 0.65T(c), respectively, which are attributed to the two-band nature of superconductivity in Lu2Fe3Si5. The penetration depth of lambda(ab)(T) follows a power law (similar to T-n) below 0.4T(c), with n = 2.5 close to the values reported for the FeAs-pnictides, suggesting possible s(+/-)-wave pairing in Lu2Fe3Si5. Temperature dependence of H-c1 can be well fitted by the two-gap BCS model in the full temperature region using two superconducting gaps Delta(1) = 0.19 +/- 0.1 meV and Delta(2) = 1.02 +/- 0.1 meV. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：5 / 9

页数：5

共 35 条

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