%0 Journal Article
%T Quasiparticle Density of States of Clean and Dirty s-Wave Superconductors in the Vortex State
%A M. Nohara
%A M. Isshiki
%A F. Sakai
%A H. Takagi
%J Physics
%D 1999
%I arXiv
%R 10.1143/JPSJ.68.1078
%X 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.
%U http://arxiv.org/abs/cond-mat/9902264v1