Magnetization Process and Adiabatic Demagnetization of the Antiferromagnetic Spin-1/2 Heisenberg Cubic Cluster

摘要

A full energy spectrum of the spin-1/2 Heisenberg cubic cluster is used toinvestigate a low-temperature magnetization process and adiabaticdemagnetization of this zero-dimensional 2x2x2 quantum spin system. It is shownthat the antiferromagnetic spin-1/2 Heisenberg cube exhibits at low enoughtemperatures a stepwise magnetization curve with four intermediate plateaux atzero, one quarter, one half, and three quarters of the saturationmagnetization. We have also found the enhanced magnetocaloric effect close tolevel-crossing fields that determine transitions between the intermediateplateaux.