Macroscopic anisotropy in superconductors with anisotropic gaps

V. G. Kogan

doi:10.1103/PhysRevB.66.020509

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Macroscopic anisotropy in superconductors with anisotropic gaps

V. G. Kogan

DOI 10.1103/PhysRevB.66.020509 · Physical Review B

T1

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Abstract

It is shown within the weak-coupling model that the macroscopic superconducting anisotropy for materials with a 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 γ(T) defined as the ratio of London penetration depths, λc/λab, is evaluated for all T’s. Within the two-gap model of MgB2, γ(T) is an increasing function of T.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown