Anisotropy of critical fields in MgB2: Two-Band ginzburg-landau theory for layered superconductors
Author
Askerzade, I. N.
Tanatar, Bilal
Date
2009Source Title
Communications in Theoretical Physics
Print ISSN
0253-6102
Electronic ISSN
1572-9494
Publisher
IOP Institute of Physics Publishing
Volume
51
Issue
3
Pages
563 - 569
Language
English
Type
ArticleItem Usage Stats
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Abstract
The temperature dependence of the anisotropy parameter of upper critical field γHc2 (T) Hc2 (T)/Hc2 (T) and London penetration depth γλ(T) λ(T)/λ (T) are calculated using two-band Ginzburg-Landau theory for layered superconductors. It is shown that, with decreasing temperature the anisotropy parameter γHc2 (T) is increased, while the London penetration depth anisotropy γλ(T) reveals an opposite behavior. Results of our calculations are in agreement with experimental data for single crystal MgB2 and with other calculations. Results of an analysis of magnetic field Hc1 in a single vortex between superconducting layers are also presented.
Keywords
Critical magnetic fieldsGinzburgïlandau theory
Layered superconductors
Two-band superconductivity