Anomalous temperature dependence of spin susceptibility around a nonmagnetic impurity in high- (formula presented) cuprate superconductors

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Abstract

Local magnetic properties around a nonmagnetic impurity are investigated in the superconducting state of high- (formula presented) cuprates. We consider a model two-dimensional (formula presented)-wave superconductor with strong antiferromagnetic (AF) spin fluctuations and calculate the spin susceptibility around the impurity. We show that the uniform susceptibility, which is usually suppressed in spin-singlet superconductivity, increases with decreasing temperature around the impurity when the impurity scattering is in the unitarity limit. This anomalous temperature dependence is more remarkable when the impurity potential is extended spatially and the AF spin fluctuations are stronger. Our results agree with the anomalous temperature dependence of the Knight shift on Li that was recently observed in (formula presented).

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number5
DOIs
Publication statusPublished - 2002 Jan 1
Externally publishedYes

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cuprates
Impurities
magnetic permeability
impurities
temperature dependence
Spin fluctuations
Temperature
Superconductivity
two dimensional models
Superconducting materials
Magnetic properties
superconductivity
Cuprate superconductors
Scattering
magnetic properties
nuclear magnetic resonance
scattering
temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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abstract = "Local magnetic properties around a nonmagnetic impurity are investigated in the superconducting state of high- (formula presented) cuprates. We consider a model two-dimensional (formula presented)-wave superconductor with strong antiferromagnetic (AF) spin fluctuations and calculate the spin susceptibility around the impurity. We show that the uniform susceptibility, which is usually suppressed in spin-singlet superconductivity, increases with decreasing temperature around the impurity when the impurity scattering is in the unitarity limit. This anomalous temperature dependence is more remarkable when the impurity potential is extended spatially and the AF spin fluctuations are stronger. Our results agree with the anomalous temperature dependence of the Knight shift on Li that was recently observed in (formula presented).",
author = "Yoji Ohashi",
year = "2002",
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doi = "10.1103/PhysRevB.66.054522",
language = "English",
volume = "66",
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T1 - Anomalous temperature dependence of spin susceptibility around a nonmagnetic impurity in high- (formula presented) cuprate superconductors

AU - Ohashi, Yoji

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N2 - Local magnetic properties around a nonmagnetic impurity are investigated in the superconducting state of high- (formula presented) cuprates. We consider a model two-dimensional (formula presented)-wave superconductor with strong antiferromagnetic (AF) spin fluctuations and calculate the spin susceptibility around the impurity. We show that the uniform susceptibility, which is usually suppressed in spin-singlet superconductivity, increases with decreasing temperature around the impurity when the impurity scattering is in the unitarity limit. This anomalous temperature dependence is more remarkable when the impurity potential is extended spatially and the AF spin fluctuations are stronger. Our results agree with the anomalous temperature dependence of the Knight shift on Li that was recently observed in (formula presented).

AB - Local magnetic properties around a nonmagnetic impurity are investigated in the superconducting state of high- (formula presented) cuprates. We consider a model two-dimensional (formula presented)-wave superconductor with strong antiferromagnetic (AF) spin fluctuations and calculate the spin susceptibility around the impurity. We show that the uniform susceptibility, which is usually suppressed in spin-singlet superconductivity, increases with decreasing temperature around the impurity when the impurity scattering is in the unitarity limit. This anomalous temperature dependence is more remarkable when the impurity potential is extended spatially and the AF spin fluctuations are stronger. Our results agree with the anomalous temperature dependence of the Knight shift on Li that was recently observed in (formula presented).

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