Emergence of Non-Axisymmetric Vortex in Strong-Coupling Chiral p-Wave   Superconductor
  We studied strong-coupling effect upon an isolated vortex in a two-dimensional chiral p-wave superconductor. We solved the Eilenberger equation for the quasiclassical Green's functions and the Eliashberg equation with single mode Einstein boson self-consistently. We calculated the free-energy of each obtained vortex, and found that a non-axisymmetric vortex metastably exists in some situation. 
Noriyuki Kurosawa and Yusuke Kato
cond-mat.supr-con