Synthesis and superconducting properties of CaC6

被引：37
|
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.
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页数：7
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