Macroscopic anisotropy in superconductors with anisotropic gaps

Abstract

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 $T$.

4 pages, 2 figures

References in corpus (5)

• Temperature and field dependence of the anisotropy of MgB2
• Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2
• Temperature dependence and anisotropy of the bulk upper critical field H_c2 of MgB_2
• Temperature-dependent $H_{c2}$ anisotropy in MgB${}_2$ as inferred from measurements on polycrystals
• Superconducting anisotropy and evidence for intrinsic pinning in single crystalline MgB${}_2$

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