Non-uniform and anisotropic electric polarizability resulting in pronounced local repulsion minima in high-temperature superconductors
arxiv(2024)
Abstract
We demonstrate the dramatic effect of non-uniform, discrete electric
polarizability in high-T_C superconductors on the spatial fluctuations of
the short to medium range Coulomb interactions through a real-space
semiclassical model. Although this is a general property, we concentrate on the
cuprates as parent compounds, in which the charge carriers are primarily
concentrated on the O sublattice. The anisotropic effective Cu-O bond
polarization caused by charge transfer energy modulation and the O^2-
atomic polarizability together generate a non-monotonic screened hole-hole
Coulomb interaction at short distances that displays a local minimum at the
in-plane second nearest neighbor O-O distance solely along the Cu-O bond
direction. This is in accordance with the pseudogap phase anisotropy and the
short coherence length observed in many high-T_C superconductors.
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