Jump in current at the gap voltage in a superconducting junction

J. M. Coombes; J. P. Carbotte

doi:10.1103/PhysRevB.34.4622

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Jump in current at the gap voltage in a superconducting junction

J. M. Coombes, J. P. Carbotte

DOI 10.1103/PhysRevB.34.4622 · Physical Review B

T1

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Abstract

For many materials not previously considered, we have calculated the jump, at the gap voltage, in the quasiparticle current of a tunnel junction. An empirical relationship between the jump and the effective electron-phonon coupling λ-μ* previously established is confirmed. Further, a new and equally as accurate correlation is found with the strong coupling index Tc/ωln, where Tc is the critical temperature and ωln a specific characteristic phonon energy. A simple formula for the jump which includes a strong-coupling correction is derived and found to fit the observed correlation well. Finally, we study the effect on the jump of unusual values of Coulomb pseudopotential μ*. Also a δ-function electron-phonon spectral density α2F(ω) is used to help in the understanding of the range of values that is possible for the jump when α2F(ω) is not restricted to realistic shapes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.48	Pressure not reported	unknown
V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.1	Pressure not reported	unknown
In0.9Tl0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.28	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.26	Pressure not reported	unknown
V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13.8	Pressure not reported	unknown
V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.4	Pressure not reported	unknown
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14	Pressure not reported	unknown
V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18	Pressure not reported	unknown
Pb0.4Tl0.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.6	Pressure not reported	unknown
Pb0.6Tl0.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.9	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.19	Pressure not reported	unknown
Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18.05	Pressure not reported	unknown
Hg Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.19	Pressure not reported	unknown
Pb0.6Bi0.2Tl0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.26	Pressure not reported	unknown
Pb0.9Bi0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.65	Pressure not reported	unknown
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	Pressure not reported	unknown
Pb0.8Bi0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.95	Pressure not reported	unknown
Pb0.7Bi0.3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.45	Pressure not reported	unknown
Pb0.65Bi0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.95	Pressure not reported	unknown