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

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

1999-02-19

arxiv.org/abs/cond-mat/9902264v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, to appear in J. Phys. Soc. Jpn. Vol. 68 No. 4

Scientific paper

10.1143/JPSJ.68.1078

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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