1999/04/22 by R. Kilian, S. Krivenko, Giniyat Khaliullin +3 · 1 citation
Materials Science · Physics and Astronomy · #Magnetic properties of thin films #Magnetism in coordination complexes #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.59.14432
published as Phys. Rev. B 59, 14432 (1999). · PRB B1 01June99
arxiv created 1999/04/22 · openalex publication_date 1999/06/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a theory of magnetic (S=1) Ni and nonmagnetic Zn impurities in underdoped cuprates. Both types of impurities are shown to induce S=(1)/(2) moments on Cu sites in the proximity of the impurity, a process which is intimately related to the spin gap phenomenon in cuprates. Below a characteristic Kondo temperature, the Ni spin is partially screened by the Cu moments, resulting in an effective impurity spin S=(1)/(2). We further analyze the Ruderman-Kittel-Kasiya-Yosida--type response of planar Cu spins to a polarization of the effective impurity moments and derive expressions for the corresponding 17O NMR line broadening. The peculiar aspects of recent experimental NMR data can be traced back to different spatial characteristics of Ni and Zn moments, as well as to an inherent temperature dependence of local antiferromagnetic correlations.