Penetration depth anisotropy in two-band superconductors
V. G. Kogan, N. V. Zhelezina
TL;DR
This paper investigates how the anisotropy of the London penetration depth varies in two-band superconductors, considering different scattering regimes and their effects on temperature dependence.
Contribution
It provides a theoretical analysis of penetration depth anisotropy in two-band superconductors with arbitrary scattering, highlighting the dominance of the clean band and effects of inter-band scattering.
Findings
Anisotropy is dominated by the clean band when one band is clean and the other is dirty.
Inter-band scattering suppresses the temperature dependence of anisotropy.
Anisotropy remains weakly temperature dependent under certain scattering conditions.
Abstract
The anisotropy of the London penetration depth is evaluated for two-band superconductors with arbitrary inter- and intra-band scattering times. If one of the bands is clean and the other is dirty in the absence of inter-band scattering, the anisotropy is dominated by the Fermi surface of the clean band and is weakly temperature dependent. The inter-band scattering also suppress the temperature dependence of the anisotropy.
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