Nonmagnetic impurity effects on antiferromagnetic spin fluctuations in high-Tc superconductivity

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Abstract

We investigate nonmagnetic impurity effects on antiferromagnetic (AF) spin fluctuations in dx2-y2-wave superconductivity. We show that, far below the transition temperature (Tc), the low-energy AF spin fluctuations are enhanced by impurity scatterings in the unitarity limit owing to the formation of low-energy bound states around the impurities. As a result, the nuclear-spin lattice relaxation rate on Cu (1/(T1T)Cu) increases at low temperatures even below Tc. On the other hand, the enhancement of the AF spin fluctuations does not occur in the case of the Born scattering because of the absent of the bound states. The result in the unitarity limit can explain the anomalous increase of 1/(T1T)Cu which was recently observed in Zn-doped YBa2Cu4O8.

Original languageEnglish
Pages (from-to)74-77
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume357-360
Issue numberSUPPL. 2
DOIs
Publication statusPublished - 2001 Aug 1
Externally publishedYes

Keywords

  • Antiferromagnetic spin fluctuations
  • High-T superconductivity
  • Nonmagnetic impurity effect
  • Nuclear-spin lattice relaxation rate

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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