On temperature-dependent anisotropies of upper critical field and London penetration depth

Abstract

We show on a few examples of one-band materials with spheroidal Fermi surfaces and anisotropic order parameters that anisotropies ${\gamma }_H$ of the upper critical field and ${\gamma }_{\lambda }$ of the London penetration depth depend on temperature, the feature commonly attributed to multi-band superconductors. The parameters ${\gamma }_H$ and ${\gamma }_{\lambda }$ may have opposite temperature dependencies or may change in the same direction depending on Fermi surface shape and on character of the gap nodes. For two-band systems, the behavior of anisotropies is affected by the ratios of bands densities of states, Fermi velocities, anisotropies, and order parameters. We investigate in detail the conditions determining the directions of temperature dependences of the two anisotropy factors.

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Cited by in corpus (8)

• Analysis of the London penetration depth in Ni-doped CaKFe4As4
• Anomalous Anisotropy of the Lower Critical Field and Meissner Effect in UTe2
• Multi-band $s_{++}$ superconductivity in ${\text{V}}_3\text{Si}$ determined from the response to a controlled disorder
• Nodal multigap superconductivity in the anisotropic iron-based compound RbCa2Fe4As4F2
• Temperature dependence of London penetration depth anisotropy in superconductors with anisotropic order parameters
• Superconductivity and magnetic and transport properties of single-crystalline CaK(Fe${}_{1-x}$Cr${}_x$)${}_4$As${}_4$
• Intrinsic coherence length anisotropy in nickelate, and some pnictide, and chalcogenide superconductors
• Possible unconventional order parameter in single crystals of SrPt${}_3$P superconductor