I. N. Askerzade, “Anisotropy of the upper critical field in MgB<nobr>$_{2}$</nobr>: the two-band Ginzburg–Landau theory”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2005, Volume 81, Issue 11,Pages <nobr>717

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Anisotropy of the upper critical field in MgB$_{2}$: the two-band Ginzburg–Landau theory

I. N. Askerzade^ab

^a Institute of Physics, Azerbaijan National Academy of Sciences, Baku-AZ1143, Azerbaijan
^b Department of Physics, Faculty of Sciences, Ankara University, 06100,Tandogan, Ankara, Turkey

Abstract: The temperature dependence of the anisotropy parameter of upper critical field $\gamma _{H_{c2}}(T)={H_{c2}^{\parallel }(T)}/{H_{c2}^{\perp }(T)}$ is calculated using two-band Ginzburg–Landau theory for layered superconductors. It is shown that, with decreasing temperature anisotropy parameter $\gamma (T)$ is increased. Result of calculations are in agreement with experimental data for single crystals of MgB$_{2}$ and with other calculations.

PACS: 74.20.De

Received: 18.03.2005
Revised: 04.05.2005

Language: English