Magnetocaloric effect in two-dimensional spin-1/2 antiferromagnets

TL;DR

This study investigates the magnetocaloric effect in two-dimensional spin-1/2 antiferromagnets, revealing that geometric frustration enhances the entropy change near saturation, which could improve cooling applications.

Contribution

It provides numerical analysis of the magnetocaloric effect in square and triangular lattices, highlighting the impact of frustration on entropy and magnetocaloric properties.

Findings

Entropy is higher on the frustrated triangular lattice.

Universal properties of entropy are consistent across lattices.

Frustration enhances magnetocaloric effects.

Abstract

The magnetocaloric effect is studied at the transition to saturation in the antiferromagnetic spin-1/2 Heisenberg model on the simplest two-dimensional lattices, namely the square and the triangular lattice. Numerical results are presented for the entropy which are consistent with identical universal properties. However, the absolute values of the entropy are bigger on the geometrically frustrated triangular lattice than on the non-frustrated square lattice, indicating that frustration improves the magnetocaloric properties.