Canonical-Ensemble Calculations of the Magnetic Susceptibility for a Spin-1/2 Spherical Kagome Cluster With Dzyaloshinskii–Moriya Interactions by Using Microcanonical Thermal Pure Quantum States

For the spherical kagome system {W 72 V 30 }, which is a magnetic cluster with 30 V 4+ ions, recent experimental and theoretical studies on the magnetization process at low temperatures have indicated that Dzyaloshinskii-Moriya interaction is an important ingredient in this material. In this paper, we use microcanonical thermal pure quantum (mTPQ) states to calculate the temperature dependence of the magnetic susceptibility and compare our calculated results with an existing experimental susceptibility. These mTPQ states are generated to reproduce the smooth microcanonical ensemble, which is difficult from the canonical ensemble. We show that adequate choice of a parameter in the generation procedure of mTPQ states leads to the same temperature dependence as the canonical ensemble.