THE TWO-BAND GINZBURG-LANDAU THEORY ANALYSIS ON THE UPPER CRITICAL FIELD OF Mg1-xAlxB2

被引：0

作者：

Liu, Minxia ^{[1
]}

Ai, Jianwen ^{[2
]}

Chen, Guihua ^{[1
]}

Xu, Yongzhao ^{[1
]}

Hu, Xiduo ^{[1
]}

机构：

[1] Dongguan Univ Technol, Dept Elect Engn, Dongguan, Guangdong, Peoples R China

[2] Guangdong Elect Ind Inst, Dongguan, Guangdong, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2011年 / 25卷 / 22期

基金：

中国国家自然科学基金;

关键词：

Mg1-xAlxB2; Ginzburg-Landau theory; the upper critical field;

D O I：

10.1142/S0217979211101429

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We studied the temperature dependence of the upper critical field H-c2(T) of Mg1-xAlxB2 single crystals (x = 0.024 and 0.092) using the two-band Ginzburg-Landau theory. We found that this theory can describe H-c2(T) very well in the broad temperature range. The values of the parameters obtained by fitting experimental data to the theory indicated that the anisotropy of the sigma bands decreased with the Al concentration. Accordingly, the temperature dependence of the anisotropy ratio of H-c2 (gamma H) systematically decreased, and for x = 0.092, gamma H was nearly independent of temperature.

引用

页码：3035 / 3042

页数：8

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