Synthesis and superconducting properties of CaC6

被引：39
作者：
Emery, Nicolas [1 ]
Herold, Claire [1 ]
Mareche, Jean-Francois [1 ]
Lagrange, Philippe [1 ,2 ]
机构：
[1] Univ Henri Poincare, Nancy Univ, Lab Chim Solide Min, UMR 7555, F-54506 Vandoeuvre Les Nancy, France
[2] Inst Natl Polytech Lorraine, Ecole Europeenne Ingn Genie Mat, F-54010 Nancy, France
来源：
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS | 2008年 / 9卷 / 04期
关键词：
graphite intercalation compound; synthesis; x-ray diffraction; crystal structure; superconductivity;
D O I：
10.1088/1468-6996/9/4/044102
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Among the superconducting graphite intercalation compounds, CaC6 exhibits the highest critical temperature T-c = 11.5 K. Bulk samples of CaC6 are obtained by immersing highly oriented pyrographite pieces in a well-chosen liquid Li-Ca alloy for 10 days at 350 degrees C. The crystal structure of CaC6 belongs to the R (3) over barm space group. In order to study the superconducting properties of CaC6, magnetisation was measured as a function of temperature and direction of magnetic field applied parallel or perpendicular to the c-axis. Meissner effect was evidenced, as well as a type II superconducting behaviour and a small anisotropy. In agreement with calculations, experimental results obtained from various techniques suggest that a classical electron-phonon mechanism is responsible for the superconductivity of CaC6. Application of high pressure increases the T-c up to 15.1 K at 8 GPa.
引用
收藏
页数：7
相关论文
共 55 条
[1]  
ALEXANDER MG, 1981, SOLID STATE COMMUN, V38, P103, DOI 10.1016/0038-1098(81)90799-7
[2]   MODEL FOR SUPERCONDUCTIVITY IN GRAPHITE-INTERCALATION COMPOUNDS [J].
ALJISHI, R .
PHYSICAL REVIEW B, 1983, 28 (01) :112-116
[3]   Linear and nonlinear electrodynamic responses of bulk CaC6 in the microwave regime [J].
Andreone, A. ;
Cifariello, G. ;
Di Gennaro, E. ;
Lamura, G. ;
Emery, N. ;
Herold, C. ;
Mareche, J. F. ;
Lagrange, P. .
APPLIED PHYSICS LETTERS, 2007, 91 (07)
[4]   Scanning tunneling spectroscopy on the novel superconductor CaC6 [J].
Bergeal, N. ;
Dubost, V. ;
Noat, Y. ;
Sacks, W. ;
Roditchev, D. ;
Emery, N. ;
Herold, C. ;
Mareche, J. -F. ;
Lagrange, P. ;
Loupias, G. .
PHYSICAL REVIEW LETTERS, 2006, 97 (07)
[5]   Proton enhanced scattering and nuclear reaction analysis microcharacterization of ternary graphite-lithium-calcium intercalation compounds [J].
Berger, P ;
Pruvost, S ;
Hérold, C ;
Lagrange, P .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2004, 219 :1005-1009
[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]   Graphite intercalation compounds under pressure:: A first-principles density functional theory study [J].
Csanyi, Gabor ;
Pickard, Chris J. ;
Simons, B. D. ;
Needs, R. J. .
PHYSICAL REVIEW B, 2007, 75 (08)
[10]   Calcium d states:: Chemical bonding of CaC6 [J].
Deng, Shuiquan ;
Simon, Arndt ;
Koehler, Juergen .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2008, 47 (35) :6703-6706
123456