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- W2053711233 abstract "The results of a tunneling study of the high-${T}_{c}$, A15 superconductor ${mathrm{V}}_{3}$Ga are presented. The superconducting electron-phonon interaction spectral function ${ensuremath{alpha}}^{2}$F(ensuremath{omega}) is obtained for a set of samples with compositions spanning stoichiometry. These results are of particular interest since ${mathrm{V}}_{3}$Ga is unusual among the high-${T}_{c}$, A15 superconductors in that single-phase material can be formed on either side of stoichiometry. The results demonstrate that increased weight of ${ensuremath{alpha}}^{2}$F(ensuremath{omega}) (or so-called mode softening) occurs at low energies as stoichiometry is approached either from above or below. Concomitantly ${ensuremath{omega}}_{mathrm{log}}$ is found to show a minimum at stoichiometry. Interestingly, although ${T}_{c}$ is a symmetric function of composition around stoichiometry, ${ensuremath{omega}}_{mathrm{log}}$ is asymmetric. Hence, some other factor beyond mode softening is playing a significant factor in the systematics of the high ${T}_{c}$'s exhibited by this superconductor as a function of composition." @default.
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- W2053711233 date "1987-01-01" @default.
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- W2053711233 title "Electron tunneling spectroscopy of superconducting<i>A</i>15 V-Ga alloy films" @default.
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- W2053711233 doi "https://doi.org/10.1103/physrevb.35.115" @default.
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