Orbital upper critical field of type-II superconductors with pair breaking

V. G. Kogan; R. Prozorov

doi:10.1103/PhysRevB.88.024503

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Orbital upper critical field of type-II superconductors with pair breaking

V. G. Kogan, R. Prozorov

DOI 10.1103/PhysRevB.88.024503 · Physical Review B

T1

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Abstract

The orbital upper critical field Hc2 is evaluated for isotropic materials with arbitrary transport and pair-breaking scattering rates. It is shown that unlike transport scattering which enhances Hc2, the pair breaking suppresses the upper critical field and reduces the dimensionless ratio h*(0)=Hc2(0)/Tc(dHc2/dT)Tc from the Helfand-Werthamer value of ≈0.7 to 0.5 for a strong pair breaking. h*(T) is evaluated for arbitrary transport and pair-breaking scattering. A phenomenological model for the pair-breaking suppression by magnetic fields is introduced. It shows qualitative features such as a positive curvature of Hc2(T) and the low temperature upturn usually associated with multiband superconductivity.

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
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown