Anisotropy parameters of superconducting MgB$_2$
arXiv:cond-mat/0212383 · doi:10.1016/S0921-4534(02)02293-1
Abstract
Data on macroscopic superconducting anisotropy of MgB$_2$ are reviewed. The data are described within a weak coupling two-gaps anisotropic s-wave model of superconductivity. The calculated ratio of the upper critical fields $γ_H=H_{c2,ab}/H_{c2,c}$ increases with decreasing temperature in agreement with available data, whereas the calculated ratio of London penetration depths $γ_λ=λ_c/λ_{ab}$ decreases to reach $\approx 1.1$ at T=0. Possible macroscopic consequences of $γ_λ\neγ_H$ are discussed.
accepted to Physica C, special MgB2 issue