Experimental evidence of s-wave superconductivity in bulk CaC6

被引：60

作者：

Lamura, G ^{[1
]}

Aurino, M

Cifariello, G

Di Gennaro, E

Andreone, A

Emery, N

Hérold, C

Marêché, JF

Lagrange, P

机构：

[1] Univ Naples Federico II, CNR, INFM Coherencia, I-80125 Naples, Italy

[2] Univ Naples Federico II, Dept Phys, I-80125 Naples, Italy

[3] Univ Nancy 1, Lab Chim Solide Mineral, UMR 7555, F-54506 Vandoeuvre Les Nancy, France

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.96.107008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The temperature dependence of the in-plane magnetic penetration depth, lambda(ab)(T), has been measured in a c-axis oriented polycrystalline CaC6 bulk sample using a high-resolution mutual inductance technique. A clear exponential behavior of lambda(ab)(T) has been observed at low temperatures, strongly suggesting isotropic s-wave pairing. Data fit using the standard BCS theory yields lambda(ab)(0)=(720 +/- 80) A and Delta(0)=(1.79 +/- 0.08) meV. The ratio 2 Delta(0)/k(B)T(c)=(3.6 +/- 0.2) gives indication for a weakly coupled superconductor.

引用

页数：4

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