Two-dimensional frustrated spin systems in high magnetic fields

TL;DR

This paper presents numerical analysis of the S=1/2 frustrated J1-J2 Heisenberg model on a square lattice under high magnetic fields, exploring phase diagrams, saturation fields, and magnetocaloric effects to understand magnetic properties.

Contribution

It provides a comprehensive numerical study of the full phase diagram and magnetic properties of the frustrated J1-J2 model in high magnetic fields, including the magnetocaloric effect.

Findings

Phase diagram mapped across frustration angles and temperatures.

Saturation field dependence on model parameters analyzed.

Magnetocaloric effect used to determine interaction constants.

Abstract

We discuss our numerical results on the properties of the S = 1/2 frustrated J1-J2 Heisenberg model on a square lattice as a function of temperature and frustration angle phi = atan(J2/J1) in an applied magnetic field. We cover the full phase diagram of the model in the range -pi <= phi <= pi. The discussion includes the parameter dependence of the saturation field itself, and addresses the instabilities associated with it. We also discuss the magnetocaloric effect of the model and show how it can be used to uniquely determine the effective interaction constants of the compounds which were investigated experimentally.