Functional derivatives of the current jump at the superconducting gap

J. M. Coombes; J. P. Carbotte

doi:10.1103/PhysRevB.35.6643

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Functional derivatives of the current jump at the superconducting gap

J. M. Coombes, J. P. Carbotte

DOI 10.1103/PhysRevB.35.6643 · Physical Review B

T1

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Abstract

A new method is developed to calculate the functional derivative of the real-axis gap function Δ(ω) and its derivatives with frequency ω. It is tested against previous results for the functional derivative of the gap edge and applied to a calculation of the functional derivative with electron phonon [δJR/δα2F(Ω)] and paramagnon [δJR/δP(Ω)] spectral densities of the normalized quasiparticle current jump (JR) at the gap edge in a tunneling junction.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown