Evidence of nonphononic superconductivity in Nb3Ge

K. E. Kihlstrom; P. D. Hovda; Vladimir Z. Kresin; S. A. Wolf

doi:10.1103/PhysRevB.38.4588

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Evidence of nonphononic superconductivity in Nb3Ge

K. E. Kihlstrom, P. D. Hovda, Vladimir Z. Kresin, S. A. Wolf

DOI 10.1103/PhysRevB.38.4588 · Physical Review B

T1

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Abstract

We present the results of a quantitative test to separate phononic from nonphononic contributions to the superconductivity in A15 Nb3Ge. This test is based on analysis of heat capacity and tunneling α2F(ω) data and neutron-scattering data. We obtained evidence for a substantial contribution of a nonphononic mechanism to the superconducting state in Nb3Ge. In contrast, our results suggest the superconducting state in Pb and V3Si is due to phonons.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure not reported	unknown
V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16.8	Pressure not reported	unknown