Impurity-induced gap modification in anisotropic superconductors: Mixed-state specific heat of La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C

M. Nohara, H. Suzuki, N. Mangkorntong, H. Takagi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have examined the effect of nonmagnetic impurity on the superconducting gap of La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C from the mixed-state specific heat C(T,H). In La2-xSrxCuO4, impurity scattering leads to an appearance of a finite density of states (DOS) at the Fermi level, consistent with d-wave pairing state with nonmagnetic impurity scattering. In contrast, nonmagnetic impurity scattering in YNi2B2C leads to a smearing of the gap anisotropy and the opening of a gap in the DOS over the whole Fermi surface, though C(T, H) for pure compound suggests the presence of anisotropic gap. This indicates YNi2B2C is a highly anisotropic s-wave superconductor.

Original languageEnglish
Pages (from-to)42-45
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume357-360
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Borocarbide
  • Impurity
  • LSCO
  • Specific heat
  • Superconducting gap

ASJC Scopus subject areas

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

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