Singularity of the Vortex Density of States in d-wave Superconductors
N. B. Kopnin, G. E. Volovik
Abstract
In d-wave superconductors, the electronic density of states (DOS) induced by a vortex exhibits 1/|E| divergency at low energies. It is the result of gap nodes in the excitations spectrum outside the vortex core. The heat capacity in two regimes, (T/Tc)2 >> B/Bc2 and (T/Tc)2 << B/Bc2, is discussed.
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