Low temperature behavior of the electronic specific heat C(T) in the mixed state is by the self-consistent calculation of the Eilenberger theory. In addition to γ T-term (γ is a Sommerfeld coefficient), C(T) has significant contribution of T^2-term intrinsic in the vortex state. We identify the origin of the T^2-term as (i) V-shape density of states in the vortex state and (ii) Kramer-Pesch effect of vortex core shrinking upon lowering T. These results both for full-gap and line node cases

more »

... l that the vortex core is a richer electronic structure beyond the normal core picture.