Data on macroscopic superconducting anisotropy of MgB2 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 γH=Hc2,ab/Hc2,c increases with decreasing temperature in agreement with available data, whereas the calculated ratio of London penetration depths γλ=λc/λab decreases to reach ≈1.1 at T=0. Possible macroscopic consequences of γλ=γH are discussed.
@article{arxiv.cond-mat/0212383,
title = {Anisotropy parameters of superconducting MgB$_2$},
author = {V. G. Kogan and S. L. Bud'ko},
journal= {arXiv preprint arXiv:cond-mat/0212383},
year = {2009}
}