Incommensurate magnetism in cuprate materials

TL;DR

This paper demonstrates that the single-band 2D Hubbard model can explain incommensurate magnetism observed in cuprates at low doping and predicts a link between incommensurability and superconductivity.

Contribution

It shows the Hubbard model's effectiveness in describing incommensurate magnetism and predicts a proportionality between incommensurability amplitude and critical temperature.

Findings

Incommensurate magnetic phase observed in LSCO at low doping.

Hubbard model reproduces experimental incommensurability.

Predicted proportionality between incommensurability and critical temperature.

Abstract

In the low doping region an incommensurate magnetic phase is observed in LSCO. By means of the composite operator method we show that the single-band 2D Hubbard model describes the experimental situation. In the higher doping region, where experiments are not available, the incommensurability is depressed owing to the van Hove singularity near the Fermi level. A proportionality between the incommensurability amplitude and the critical temperature is predicted, suggesting a close relation between superconductivity and incommensurate magnetism.