# Magnetocaloric properties of frustrated tetrahedra-based spin nanoclusters

## TL;DR

This study investigates how the topology of frustrated tetrahedra-based spin nanoclusters influences their magnetocaloric properties, revealing potential for ultra-low temperature refrigeration applications.

## Contribution

It provides the first exact enumeration analysis of magnetocaloric effects in various geometrically frustrated tetrahedra-based nanoclusters with different sharing topologies.

## Key findings

- Properties vary significantly with nanocluster topology.
- Most structures lack a zero-magnetization plateau at low temperatures.
- Giant magnetocaloric effect observed in certain configurations.

## Abstract

Magnetization, entropy and magnetocaloric properties of various geometrically frustrated tetrahedra-based Ising antiferromagnetic nanoclusters with corner-, edge-, and face-sharing topologies are studied by exact enumeration. It is found that the studied properties strongly depend on the nanocluster topology and can be very different from those of a single tetrahedron as well as the pyrochlore lattice formed by an infinite number of corner-sharing tetrahedra. From the magnetocaloric point of view an important difference from the latter two systems is the absence of the ground-state zero-magnetization plateau in most of the studied structures, which at low temperatures facilitates emergence of a giant magnetocaloric effect in a vanishing magnetic field in the adiabatic demagnetization process. Magnetic systems with such properties might be suitable candidates for technological application as efficient refrigerators to ultra-low temperatures.