Anomalous temperature dependence of spin susceptibility around a nonmagnetic impurity in high-Tc cuprate superconductors

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Abstract

Local magnetic properties around a nonmagnetic impurity are investigated in the superconducting state of high-Tc cuprates. We consider a model two-dimensional dx2-y2-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 YBa2(Cu1-xLix)3O6+y.

Original languageEnglish
Article number054522
Pages (from-to)545221-545228
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number5
Publication statusPublished - 2002 Aug 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

  • 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-Tc cuprates. We consider a model two-dimensional dx2-y2-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 YBa2(Cu1-xLix)3O6+y.",
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AU - Ohashi, Yoji

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N2 - Local magnetic properties around a nonmagnetic impurity are investigated in the superconducting state of high-Tc cuprates. We consider a model two-dimensional dx2-y2-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 YBa2(Cu1-xLix)3O6+y.

AB - Local magnetic properties around a nonmagnetic impurity are investigated in the superconducting state of high-Tc cuprates. We consider a model two-dimensional dx2-y2-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 YBa2(Cu1-xLix)3O6+y.

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