  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.
