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In d-wave superconductors, the electronic density of states (DOS) induced by a vortex exhibits a divergence at low energies: N vortex(E) ∼1/|E|. This divergence is the result of gap nodes in the spectrum of excitation outside the vortex core. The heat capacity in two regimes, T 2/T ≫ B/B c 2 and T 2/T ≪ B/B c 2, is discussed.
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Kopnin et al. (1996) studied this question.
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