Author:
Jiang 姜 Litong 丽桐,Jiang 姜 C. Y. 聪颖,Tian 田 Y. C. 义超,Zhao 赵 H. 惠,Zhang 张 J. 俊,Tian 田 Z. Y. 珍耘,Fu 付 S. H. 少华,Liang 梁 E. J. 二军,Wang 望 X. C. 贤成,Jin 靳 Changqing 常青,Zhao 赵 Jimin 继民
Abstract
Ba6Cr2S10 is a recently discovered magnetic material, in which the spins are aligned ferromagnetically in the ab-plane and anti-parallelly in a paired form along the c-axis. It is characterized as a quasi-one dimensional (1D) dimerized structure with a ferrotoroidic order, forming the simplest candidate toroidal magnetic (TM) order and exhibiting an anti-ferromagnetic-like transition at around 10 K. Time-resolved ultrafast dynamics investigation of the novel A–Cr–S (A: metal elements) family of quantum materials has rarely been reported. Here, we investigate the time-resolved pump-probe ultrafast dynamics of a Ba6Cr2S10 single crystal. A prominent change in the photo-excited carrier dynamics is observed at T
c = 10 K, corresponding to the reported TM-paramagnetic phase transition. A potential unknown magnetic transition is also found at T
* = 29 K. Our results provide new evidence for the TM magnetic transition in Ba6Cr2S10, and shed light on phase transitions in TM quantum materials.