Temperature-dependent anisotropies of upper critical field and London penetration depth

Journal Article · 25 July 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.014518 · OSTI ID:1556096

Kogan, V. G. ^[1]; Prozorov, R. ^[1]; Koshelev, A. E. ^[2]

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1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
2. Argonne National Lab. (ANL), Lemont, IL (United States)

In this work, we show on a few examples of one-band materials with spheroidal Fermi surfaces and anisotropic order parameters that anisotropies γ_H of the upper critical field and γ_λ of the London penetration depth depend on temperature, a feature commonly attributed to multiband superconductors. The parameters γ_H and γ_λ may have opposite temperature dependences or may change in the same direction depending on the Fermi-surface shape and on the 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. Lastly, we investigate in detail the conditions determining the directions of temperature dependences of the two anisotropy factors.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
• Grant/Contract Number: AC02-07CH11358
• OSTI ID: 1556096
• Report Number(s): IS-J--9996
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 100; ISSN 2469-9950; ISSN PRBMDO
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English