Carbon-substitution effect on the electronic properties of MgB2 single crystals -: art. no. 024504

被引：159

作者：

Masui, T ^{[1
]}

Lee, S ^{[1
]}

Tajima, S ^{[1
]}

机构：

[1] ISTEC, Superconduct Res Lab, Tokyo 1350062, Japan

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 02期

基金：

日本学术振兴会;

关键词：

D O I：

10.1103/PhysRevB.70.024504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electronic properties of the carbon-substituted MgB2 single crystals are reported. The carbon substitution drops T-c below 2 K. In-plane resistivity shows a remarkable increase in residual resistivity by C substitution, while the change of in-plane/out-of-plane Hall coefficients is rather small. Raman scattering spectra indicate that the E-2g-phonon frequency radically hardens with increasing the carbon content, suggesting the weakening of electron-phonon coupling. Another striking C effect is the increases of the second critical fields in both in-plane and out-of-plane directions, accompanied by a reduction in the anisotropy ratio. The possible changes in the electronic state and the origin of T-c suppression by C substitution are discussed.

引用

页码：024504 / 1

页数：7

共 48 条

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