Disordered phase of a two-dimensional Heisenberg Model with S=1

TL;DR

This paper investigates an anisotropic S=1 two-dimensional Heisenberg model, identifying a second-order phase transition from a Néel ordered phase to a disordered, gapped phase.

Contribution

It introduces analysis of an S=1 anisotropic J1-J2 model and characterizes the phase transition to a disordered phase.

Findings

Second-order transition from Néel to disordered phase

Disordered phase exhibits a spin gap

Transition occurs at specific anisotropy parameters

Abstract

We study an anisotropic version of the $J_1-J_2$ model with S=1. We find a second order transition from a N\'eel $Q=(\pi,\pi)$ phase to a disordered phase with a spin gap.