Paramagnetic Torque and Crystallographic Domain Distributions in an Iron Iodine Boracite Single Crystal

抄録

Paramagnetic torque in an iron iodine boracite single crystal was measured in the temperature range between 30 K and 358 K. The observed torque curves were analysed by phenomenological treatment based on a possible domain distribution in a crystal. The ratio of the volumes of different kinds of domains were estimated from the results for the crystal before and after an electric field annealing. Anomalies in the temperature dependence of torque were observed at the crystallographic transitions. A large thermal hysteresis in the orthorhombic rhombohedral transition previously observed in the lattice strain measurement was reconfirmed.