Anomaly of quasi-particle density of states in the vortex state of NbSe2

T. Hanaguri, A. Koizumi, K. Takaki, M. Nohara, H. Takagi, K. Kitazawa

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Magnetic field H dependence of the electronic specific heat coefficient y was measured in various NbSe2 crystals in the vortex states. With increasing residual resistivity ratio, γ(H) changed from conventional γ ∝ H behavior to the strongly sublinear function of H. The sublinear H dependence of γ is similar to that of nodal superconductors, while NbSe2 is a nodeless superconductor. From measurements on the sample containing columnar defects, we found that the γ anomaly is brought by quasi-particle states outside of the vortex cores. This result suggests that excess quasi-particle states are generated by Doppler energy shift caused by supercurrent around vortices.

Original languageEnglish
Pages (from-to)1355-1356
Number of pages2
JournalPhysica B: Condensed Matter
Volume329-333
Issue numberII
DOIs
Publication statusPublished - May 2003
Externally publishedYes

Keywords

  • Electronic specific heat coefficient
  • NbSe
  • Vortex state

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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