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Quasiparticle Density of States of Clean and Dirty s-Wave Superconductors in the Vortex State

M. Nohara·M. Isshiki·F. Sakai·H. Takagi
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Abstract

The quasiparticle density of states (DOS) in the vortex state has been probed by specific heat measurements under magnetic fields (H) for clean and dirty s-wave superconductors, Y(Ni1-xPtx)2B2C and Nb1-xTaxSe2. We find that the quasiparticle DOS per vortex is appreciably H-dependent in the clean-limit superconductors, while it is H-independent in the dirty superconductors as expected from a conventional rigid normal electron core picture. We discuss possible origins for our observations in terms of the shrinking of the vortex core radius with increasing H.

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M. Nohara, M. Isshiki, F. Sakai, H. Takagi. 1999-02-19. Quasiparticle Density of States of Clean and Dirty s-Wave Superconductors in the Vortex State. https://doi.org/10.1143/jpsj.68.1078

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