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.
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页数：4
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