Abstract
A possible effect of spin fluctuations on the electric field gradient in Cu-O layers in HTCS is studied by the phenomenological antiferromagnetic Fermi-liquid theory of Millis et al. Our theoretical analysis suggests that the coupling between the quadrupole charge density and the spin fluctuations in the two-dimensional 'metallic' Cu-O layers is the origin of the temperature dependence of 63Cu NQR frequencies at the Cu(2) sites in YBa2Cu3O7- delta .
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