Existence of electronic dipole lattice on CuO2 plane of cuprate superconductor

TL;DR

This paper proposes that the CuO2 plane in cuprate superconductors contains an electronic dipole lattice due to ion position differences, offering new insights into pairing mechanisms and normal state properties.

Contribution

It introduces the concept of an electronic dipole lattice on the CuO2 plane, challenging traditional band theory assumptions and explaining key superconducting features.

Findings

Dipole lattice influences pairing mechanism and d-wave symmetry.

Violations in charge distribution are treatable as perturbations near optimal doping.

Explains linear temperature dependence of normal state resistivity.

Abstract

The existing theory about the cuprate superconductor bases on band theory, almost all neglects the position difference of Cu-O ions on CuO2 plane, and assumes that the charge on ions are averagely distributed. Considering that the nature of conduction is the moving of electrons, carrier means electron in this article. The charge opposite the carriers distributes on fixed ions, and the position difference of Cu-O ions slightly violates average electricity distribution, so the concept of hole is not suitable. It is proved that, near the optimal doping level, since the density of ions is relatively low, the violations can be treated as a perturbation, and the ion lattice can be seen as a combination of regular lattice and dipole lattice. Considering about that the character of cuprate superconductor is mainly dominated by the dipole lattice, the pairing mechanism, the d-wave symmetry, and the linear temperature dependence of normal state resistivity is tersely interpreted.