Role of d-wave pairing in A15 superconductors

Abstract

We argue that the recent Raman spectroscopy observation of a sharp mode in s-wave superconducting V3Si is due to a competing d-wave pairing state. We present microscopic arguments for the origin of this d-wave order. We further argue that the d-wave order explains the observed shrinking of the vortex core structure at anomalously low magnetic fields and the large anisotropy observed in the upper critical field.

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