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 V${}_3$Si 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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• Classification of ground states and normal modes for phase-frustrated multicomponent superconductors
• Spontaneous Breakdown of Time-Reversal Symmetry Induced by Thermal Fluctuations