Role of d-wave pairing in $A15$ superconductors
  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. 
S. Mukherjee, D. F. Agterberg
cond-mat.supr-con cond-mat.str-el