Electron tunneling spectroscopy of superconducting A15 V-Ga alloy films

S. J. Bending; M. R. Beasley; E. L. Wolf

doi:10.1103/PhysRevB.35.115

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Electron tunneling spectroscopy of superconducting A15 V-Ga alloy films

S. J. Bending, M. R. Beasley, E. L. Wolf

DOI 10.1103/PhysRevB.35.115 · Physical Review B

T1

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Abstract

The results of a tunneling study of the high-Tc, A15 superconductor V3Ga are presented. The superconducting electron-phonon interaction spectral function α2F(ω) is obtained for a set of samples with compositions spanning stoichiometry. These results are of particular interest since V3Ga is unusual among the high-Tc, A15 superconductors in that single-phase material can be formed on either side of stoichiometry. The results demonstrate that increased weight of α2F(ω) (or so-called mode softening) occurs at low energies as stoichiometry is approached either from above or below. Concomitantly ωlog is found to show a minimum at stoichiometry. Interestingly, although Tc is a symmetric function of composition around stoichiometry, ωlog is asymmetric. Hence, some other factor beyond mode softening is playing a significant factor in the systematics of the high Tc’s exhibited by this superconductor as a function of composition.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
V3Ga Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
V3Ga Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown