Antiferromagnetic Heisenberg model on anisotropic triangular lattice in the presence of magnetic field

TL;DR

This study employs Schwinger boson mean field theory to analyze how an external magnetic field influences the spin incommensurability in the antiferromagnetic Heisenberg model on an anisotropic triangular lattice, with relevance to experimental findings.

Contribution

It introduces a theoretical approach to understand magnetic field effects on spin incommensurability in a frustrated lattice model, comparing results with experimental data.

Findings

Calculated field dependence of spin incommensurability.

Results align with experimental observations in Cs$_{2}$CuCl$_{4}$.

Provides insights into magnetic field effects on frustrated spin systems.

Abstract

We use Schwinger boson mean field theory to study the antiferromagnetic spin-1/2 Heisenberg model on an anisotropic triangular lattice in the presence of a uniform external magnetic field. We calculate the field dependence of the spin incommensurability in the ordered spin spiral phase, and compare the results to the recent experiments in Cs$_{2}$CuCl$_{4}$ by Coldea et al. (Phys. Rev. Lett. 86, 1335 (2001)).