States of Local Moment Induced by Nonmagnetic Impurities in Cuprate Superconductors

Yan Chen; C. S. Ting

doi:10.1103/PhysRevLett.92.077203

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States of Local Moment Induced by Nonmagnetic Impurities in Cuprate Superconductors

Yan Chen, C. S. Ting

DOI 10.1103/PhysRevLett.92.077203 · Physical Review Letters

T1

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Abstract

By using a model Hamiltonian with d-wave superconductivity and competing antiferromagnetic (AF) orders, the local staggered magnetization distribution due to nonmagnetic impurities in cuprate superconductors is investigated. We show that the net moment induced by a single impurity corresponds to a local spin with Sz=0 or 1/2 depending on the strength of the AF interaction U and the impurity scattering strength ϵ. Phase diagram of ϵ versus U for the moment formation is presented. We discuss the connection of this result with the Kondo problem. When two impurities are placed at the nearest neighboring sites, the net moment is always zero, unusually robust to parameter changes. For two neighboring strong impurities, separated by a Cu-ion site, the induced net moment has Sz=0, 1/2, or 1.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown