Abstract
We present a systematic study on the structural and magnetic phase transitions in quasi-two-dimensional (2D) material through various experimental techniques. With decreasing the temperature, first undergoes a structural phase transition at around 90 K and then changes into the antiferromagnetic (AFM) state below 26.5 K. Interestingly, in addition to the strong AFM coupling background below 26.5 K, our single crystals also exhibit robust hysteresis loops with coercive field about 1.5 T at 2 K for , but none for . This is a typical feature of canted AFM and should not originate from a possible ferromagnetic (FM) impurities phase, because FM materials such as always have clear hysteresis loops in all magnetic field directions. Magnetization measurements of angle for rotation in both and planes also suggest as a canted AFM with easy axis slightly off the axis. Furthermore, detailed Raman spectroscopy measurements also reveal the structural phase transition at 90 K. More importantly, splitting of a doubly degenerated mode is observed, which demonstrates threefold rotational symmetry breaking in the low-temperature phase. Considering the similar structural phase transition of isostructural materials, we conclude that changes from structure to structure with stacking order change as temperature decreases.
- Received 30 January 2022
- Revised 29 July 2022
- Accepted 1 August 2022
DOI:https://doi.org/10.1103/PhysRevB.106.085430
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