Macroscopic anisotropy in superconductors with anisotropic gaps

Details Macroscopic anisotropy in superconductors with anisotropic gaps Macroscopic anisotropy in superconductors with anisotropic gaps

2002-04-01

arxiv.org/abs/cond-mat/0204038v1

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.66.020509

It is shown within the weak-coupling model that the macroscopic superconducting anisotropy for materials with the gap varying on the Fermi surface cannot be characterized by a single number, unlike the case of clean materials with isotropic gaps. For clean uniaxial materials, the anisotropy parameter $\gamma (T)$ defined as the ratio of London penetration depths, $\lambda_c/\lambda_{ab}$, is evaluated for all $T$'s. Within the two-gap model of MgB$_2$, $\gamma (T)$ is an increasing function of $T$.

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