Impurity-induced gap renormalization 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 journalConference articlepeer-review

44 Citations (Scopus)


The effect of nonmagnetic impurity on the superconducting gap is examined on La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C from the T and H dependence of the electronic specific heat Ce(T, H) at low temperatures. In La2-xSrxCuO4, impurity scattering leads to an appearance of a finite density of states (DOS) at the Fermi energy, consistent with d-wave pairing state with nonmagnetic impurity scattering in the unitarity limit. 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 Ce(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)2177-2180
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume341-348 (IV)
Publication statusPublished - Nov 2000
Externally publishedYes
EventInternational Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI - Houston, TX, USA
Duration: Feb 20 2000Feb 25 2000

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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