Specific heat of the Ca-intercalated graphite superconductor CaC6

被引：61

作者：

Kim, J. S.

Kremer, R. K.

Boeri, L.

Razavi, F. S.

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Brock Univ, Dept Phys, St Catharines, ON L2S 3A1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.96.217002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The superconducting state of Ca-intercalated graphite CaC6 has been investigated by specific heat measurements. The characteristic anomaly at the superconducting transition (T-c=11.4 K) indicates clearly the bulk nature of the superconductivity. The temperature and magnetic field dependence of the electronic specific heat are consistent with a fully gapped superconducting order parameter. The estimated electron-phonon coupling constant is lambda=0.70 +/- 0.04, suggesting that the relatively high T-c of CaC6 can be explained within the intermediate coupling BCS approach.

引用

收藏

页数：4

相关论文

共 28 条

[1] MODEL FOR AN EXCITON MECHANISM OF SUPERCONDUCTIVITY [J].

ALLENDER, D ;

BRAY, J ;

BARDEEN, J .

PHYSICAL REVIEW B, 1973, 7 (03) :1020-1029

[2] SPECIFIC-HEAT OF LIC6 FROM 4-300-K [J].

AYACHE, C ;

BONJOUR, E ;

LAGNIER, R ;

FISCHER, JE .

PHYSICA B & C, 1980, 99 (1-4) :547-550

[3] Electronic collective modes and superconductivity in layered conductors [J].

Bill, A ;

Morawitz, H ;

Kresin, VZ .

PHYSICAL REVIEW B, 2003, 68 (14)

[4] Phenomenological two-gap model for the specific heat of MgB [J].

Bouquet, F ;

Wang, Y ;

Fisher, RA ;

Hinks, DG ;

Jorgensen, JD ;

Junod, A ;

Phillips, NE .

EUROPHYSICS LETTERS, 2001, 56 (06) :856-862

[5] Specific heat of Mg11B2:: Evidence for a second energy cap -: art. no. 047001 [J].

Bouquet, F ;

Fisher, RA ;

Phillips, NE ;

Hinks, DG ;

Jorgensen, JD .

PHYSICAL REVIEW LETTERS, 2001, 87 (04) :47001-1

[6] Theoretical explanation of superconductivity in C6Ca -: art. no. 237002 [J].

Calandra, M ;

Mauri, F .

PHYSICAL REVIEW LETTERS, 2005, 95 (23)

[7] ANISOTROPIC SUPERCONDUCTIVITY IN C4KHG [J].

CHAIKEN, A ;

DRESSELHAUS, MS ;

ORLANDO, TP ;

DRESSELHAUS, G ;

TEDROW, PM ;

NEUMANN, DA ;

KAMITAKAHARA, WA .

PHYSICAL REVIEW B, 1990, 41 (01) :71-81

[8] The role of the interlayer state in the electronic structure of superconducting graphite intercalated compounds [J].

Csányi, G ;

Littlewood, PB ;

Nevidomskyy, AH ;

Pickard, CJ ;

Simons, BD .

NATURE PHYSICS, 2005, 1 (01) :42-45

[9]

DELHAES P, 1976, J PHYS LETT-PARIS, V37, pL127, DOI 10.1051/jphyslet:01976003705012700

[10] INTERCALATION COMPOUNDS OF GRAPHITE [J].

DRESSELHAUS, MS ;

DRESSELHAUS, G .

ADVANCES IN PHYSICS, 1981, 30 (02) :139-326