Nodal gap structure in the noncentrosymmetric superconductor LaNiC2 from magnetic-penetration-depth measurements

被引：43

作者：

Bonalde, I. ^{[1
]}

Ribeiro, R. L. ^{[1
]}

Syu, K. J. ^{[2
]}

Sung, H. H. ^{[2
]}

Lee, W. H. ^{[2
]}

机构：

[1] Inst Venezolano Invest Cient, Ctr Fis, Caracas 1020A, Venezuela

[2] Natl Chung Cheng Univ, Dept Phys, Chiayi 62199, Taiwan

来源：

NEW JOURNAL OF PHYSICS | 2011年 / 13卷

关键词：

PHENOMENOLOGICAL THEORY; TEMPERATURE; DEPENDENCE;

D O I：

10.1088/1367-2630/13/12/123022

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report measurements of the temperature dependence of the magnetic penetration depth in different-quality polycrystalline samples of noncentrosymmetric LaNiC2 down to 0.05 K. This compound has no magnetic phases and breaks time-reversal symmetry. In our highest-quality sample, we observe a T-2 dependence below 0.4T(c), indicative of nodes in the energy gap. We argue that previous results suggesting conventional s-wave behavior may have been affected by magnetic impurities.

引用

页数：8

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