Large Ca isotope effect in the CaC6 superconductor

被引：42
|
作者：
Hinks, D. G. [1 ]
Rosenmann, D. [1 ]
Claus, H. [1 ]
Bailey, M. S. [1 ]
Jorgensen, J. D. [1 ]
机构：
[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
来源：
PHYSICAL REVIEW B | 2007年 / 75卷 / 01期
关键词：
D O I：
10.1103/PhysRevB.75.014509
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have measured the Ca isotope effect coefficient, alpha(Ca), in the newly discovered superconductor CaC6 and find a value of 0.53(2). This result shows that the superconductivity is dominated by coupling of the electrons by Ca phonon modes. The C phonons contribute very little, assuming that this material is a conventional electron-phonon coupled superconductor. Thus, in contrast to another layered material MgB2, where high-energy phonons in the B layers are responsible for the superconductivity, in layered CaC6 the phonons responsible for superconductivity are primarily low-energy modes of the intercalated Ca.
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页数：6
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