Upper critical field in two-band superconductivity

被引：23

作者：

Mansor, M ^{[1
]}

Carbotte, JP

机构：

[1] Al Fateh Univ, Dept Phys, Tripoli, Libya

[2] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.72.024538

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use a generalization of the Werthamer-Helfand-Hohenberg equations to strong coupling and to two-band superconductivity to study the dependence of the upper critical field H-c2(T) on anisotropy in the electron-phonon coupling and in the Fermi velocities, as well as on arbitrary values of intraband and interband impurity scattering. For a layered system such as MgB2, the temperature dependence of the critical magnetic (H) field itself and the anisotropy ratio H-c2(ab)(T)/H-c2(c)(T) between ab (H in the basal plane) and c (H perpendicular to the basal plane) directions are studied. For MgB2, the anisotropy ratio is found to be particularly sensitive to intraband impurity scattering in the pi band.

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页数：13

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