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

共 24 条

[1] MODEL FOR SUPERCONDUCTIVITY IN GRAPHITE-INTERCALATION COMPOUNDS
ALJISHI, R
[J]. PHYSICAL REVIEW B, 1983, 28 (01): : 112 - 116
[2] MODEL FOR AN EXCITON MECHANISM OF SUPERCONDUCTIVITY
ALLENDER, D
BRAY, J
BARDEEN, J
[J]. PHYSICAL REVIEW B, 1973, 7 (03): : 1020 - 1029
[3] EFFECT OF THE METAL CONCENTRATION ON THE SUPERCONDUCTING PROPERTIES OF LITHIUM-CONTAINING, SODIUM-CONTAINING AND POTASSIUM-CONTAINING GRAPHITE-INTERCALATION COMPOUNDS
BELASH, IT
BRONNIKOV, AD
ZHARIKOV, OV
PALNICHENKO, AV
[J]. SYNTHETIC METALS, 1990, 36 (03) : 283 - 302
[4] Electronic collective modes and superconductivity in layered conductors
Bill, A
Morawitz, H
Kresin, VZ
[J]. PHYSICAL REVIEW B, 2003, 68 (14)
[5] Theoretical explanation of superconductivity in C6Ca -: art. no. 237002
Calandra, M
Mauri, F
[J]. PHYSICAL REVIEW LETTERS, 2005, 95 (23)
[6] The role of the interlayer state in the electronic structure of superconducting graphite intercalated compounds
Csányi, G
Littlewood, PB
Nevidomskyy, AH
Pickard, CJ
Simons, BD
[J]. NATURE PHYSICS, 2005, 1 (01) : 42 - 45
[7] INTERCALATION COMPOUNDS OF GRAPHITE
DRESSELHAUS, MS
DRESSELHAUS, G
[J]. ADVANCES IN PHYSICS, 1981, 30 (02) : 139 - 326
[8] Superconductivity of bulk CaC6 -: art. no. 087003
Emery, N
Hérold, C
d'Astuto, M
Garcia, V
Bellin, C
Marêché, JF
Lagrange, P
Loupias, G
[J]. PHYSICAL REVIEW LETTERS, 2005, 95 (08)
[9] Structural study and crystal chemistry of the first stage calcium graphite intercalation compound
Emery, N
Hérold, C
Lagrange, P
[J]. JOURNAL OF SOLID STATE CHEMISTRY, 2005, 178 (09) : 2947 - 2952
[10] BAZRO3 - THE SOLUTION FOR THE CRUCIBLE CORROSION PROBLEM DURING THE SINGLE-CRYSTAL GROWTH OF HIGH-T-C SUPERCONDUCTORS REBA(2)CU(3)O(7-DELTA) RE=Y, PR
ERB, A
WALKER, E
FLUKIGER, R
[J]. PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1995, 245 (3-4): : 245 - 251

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