Specific heat and low-lying excitations in the mixed state for a type II superconductor

Details Specific heat and low-lying excitations in the mixed state for a type II superconductor Specific heat and low-lying excitations in the mixed state for a type II superconductor

2006-04-13

arxiv.org/abs/cond-mat/0604332v1

Phys. Rev. B 73, 172501 (2006)

Physics

Condensed Matter

Superconductivity

Accepted in Phys. Rev. B. 5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.73.172501

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 $\gamma T$-term ($\gamma$ 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 reveal that the vortex core is a richer electronic structure beyond the normal core picture.

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