Incommensurate spin fluctuations in the two-dimensional t-t'-U model

TL;DR

This study investigates the magnetic properties of the 2D t-t'-U model using the Composite Operator Method, revealing how incommensurate spin fluctuations evolve with t' and align qualitatively with experimental observations in cuprates.

Contribution

It demonstrates the evolution of magnetic scattering in the t-t'-U model with varying t' using the Composite Operator Method, providing insights into incommensurate spin fluctuations.

Findings

Magnetic scattering becomes isotropic as t' increases.

Results qualitatively agree with experimental data in LSCO and YBCO.

Incommensurate spin fluctuations are characterized across different t' values.

Abstract

Magnetic properties of the two-dimensional t-t'-U model are investigated by studying the static spin magnetic susceptibility as a function of momentum for various temperatures. The calculations are performed by means of the Composite Operator Method in the static approximation. By increasing the value of the t' parameter the magnetic scattering in the reciprocal space evolves to an isotropic structure. It is shown that the results are in qualitative agreement with the experimental situation observed in LSCO and YBCO compounds.