Difference between Al and C doping in anisotropic upper critical field development in MgB2 -: art. no. 144512

被引：89

作者：

Angst, M ^{[1
]}

Bud'ko, SL

Wilke, RHT

Canfield, PC

机构：

[1] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.71.144512

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temperature dependence of the upper critical field H-c2 for both field directions in partially substituted polycrystalline MgB2 was determined. Whereas the suppression of T-c is similar for aluminum and carbon substituted samples, H-c2 is affected by the substitution in profoundly different ways. In the case of Al substitution changes can tentatively be described by intrinsic effects (shift of the Fermi level). In the C substituted samples, H-c2 is increased drastically, and extrinsic effects (disorder) have to play a major role. The strong contrast between the two substitutions is discussed, taking into account three relevant scattering rates.

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页数：6

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