First Principle Electronic Model for High-Temperature Superconductivity

TL;DR

This paper develops a first-principles electronic model for La2CuO4, capturing key high-temperature superconductivity features such as d-wave pairing and stripe phenomena through extended t-J Hamiltonian analysis.

Contribution

It introduces an effective t-J model derived from structural data, extending interactions up to fourth neighbors, to explain high-temperature superconductivity in La2CuO4.

Findings

Reproduces d-wave superconductivity at doping levels above 6%.

Finds evidence of dynamical stripes at 1/8 filling.

Models key experimental features of the HTc compound.

Abstract

Using the structural data of the La2CuO4 compound both in the low temperature tetragonal phase and in the isotropic phase we have derived an effective t-J model with hoppings t and superexchange interactions J extended up to fourth and second neareast neighbors respectively. By numerically studying this hamiltonian we have then reproduced the main experimental features of this HTc compound: d-wave superconductivity is stabilized at small but finite doping delta>6% away from the antiferromagnetic region and some evidence of dynamical stripes is found at commensurate filling 1/8.