# Enhanced magnetocaloric effect due to selective dilution in a triangular Ising antiferromagnet

## TL;DR

This study investigates how selective dilution in a triangular Ising antiferromagnet influences its magnetocaloric effect, revealing temperature-dependent enhancements and reductions in entropy change due to impurity effects.

## Contribution

It introduces an effective-field theory approach to analyze the impact of selective dilution on the magnetocaloric effect in a frustrated magnetic system.

## Key findings

- Dilution reduces ground-state entropy and weakens the magnetocaloric effect at low temperatures.
- Significant enhancement of negative isothermal entropy change observed at higher temperatures for specific dilution levels.
- Selective dilution can be used to tune the magnetocaloric properties of frustrated magnetic materials.

## Abstract

We employ an effective-field theory with correlations in order to study a magnetocaloric effect on a triangular Ising antiferromagnet, which is selectively diluted by non-magnetic impurities on one of the three sublattices. Such a dilution generally relieves massive degeneracy in our system and therefore the ground-state entropy diminishes and the magnetocaloric effect weakens at low temperatures. However, at relatively higher temperatures we can observe significantly enhanced negative isothermal entropy changes for the sublattice concentration $p_{\mathrm{A}} = 0.8$.