Abstract
The results of a single-crystal x-ray-diffraction study of the evolution of the crystal structures of with temperature with an emphasis on phase transitions are presented. Some related specific-heat and magnetization data are included. The existence of the room-temperature trigonal crystal structure (148) has been confirmed. Upon cooling, undergoes a structural phase transition to a monoclinic phase at . is reduced in magnetic fields applied along the trigonal axis. When becomes ferromagnetic at , magnetostriction-induced changes of the monoclinic-structure parameters are observed. Upon further cooling, the monoclinic structure transforms into a triclinic variant at 32 K which is most likely occurring in conjunction with the previously reported transformation of the ferromagnetic structure. The observed phenomena are preliminarily attributed to strong magnetoelastic interactions.
- Received 10 September 2019
DOI:https://doi.org/10.1103/PhysRevMaterials.3.121401
©2019 American Physical Society