Magnetization process and magnetocaloric effect of the spin-1/2 XXZ Heisenberg cuboctahedron

TL;DR

This study investigates the magnetic and magnetocaloric properties of the spin-1/2 XXZ Heisenberg cuboctahedron, revealing multiple magnetization plateaux and enhanced effects near magnetization jumps through exact numerical methods.

Contribution

It provides the first detailed analysis of magnetization plateaux and magnetocaloric behavior in the XXZ Heisenberg cuboctahedron, highlighting the influence of exchange anisotropy.

Findings

Multiple magnetization plateaux at 0, 1/6, 1/2, 2/3 of saturation

Wider field ranges of plateaux with increased quantum ($xy$) interaction

Enhanced magnetocaloric effect near magnetization jumps

Abstract

Magnetic properties of the spin-1/2 XXZ Heisenberg cuboctahedron are examined using exact numerical diagonalization depending on a relative strength of the exchange anisotropy. While the Ising cuboctahedron exhibits in a low-temperature magnetization curve only one-third magnetization plateau, the XXZ Heisenberg cuboctahedron displays another four intermediate plateaux at zero, one-sixth, one-half and two-thirds of the saturation magnetization. The novel magnetization plateaux generally extend over a wider range of magnetic fields with increasing of a quantum ($xy$) part of the XXZ exchange interaction. It is shown that the XXZ Heisenberg cuboctahedron exhibits in a vicinity of all magnetization jumps anomalous thermodynamic behavior accompanied with an enhanced magnetocaloric effect.