Lattice distortions, incommensurability, and stripes in the electric model for high-Tc cuprates

TL;DR

This paper investigates striped superconductivity in high-Tc cuprates, revealing how lattice distortions induce inhomogeneous states with coexisting magnetism and superconductivity, and how these properties vary with doping.

Contribution

It demonstrates the stability of inhomogeneous striped states with lattice distortions in the three-band Hubbard model using quantum variational Monte Carlo methods.

Findings

Stable striped states coexist with incommensurate magnetism and superconductivity.

Superconductivity order parameter oscillates with inhomogeneity, peaking in hole-rich regions.

Superconductivity condensation energy decreases with lower doping levels.

Abstract

Striped superconductivity with lattice distortions is investigated based on the three-band Hubbard model for high-Tc cuprates. A stable inhomogeneous striped state is determined in the low-temperature tetragonal (LTT) phase with lattice distortions using a quantum variational Monte Carlo method. The ground state has vertical or horizontal hole-rich arrays coexisting with incommensurate magnetism and superconductivity induced by several percent lattice distortions. The superconductivity order parameter oscillates according to the inhomogeneity in the antiferromagnetic background with its maxima in the hole-rich regions, and the superconductivity condensation energy is reduced as the doping rate decreases.