| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Ultrafast Carrier Dynamics in Ba$_{6}$Cr$_{2}$S$_{10}$ Modified by Toroidal Magnetic Phase Transition |
| Litong Jiang1, C. Y. Jiang1,3, Y. C. Tian1,2, H. Zhao1,2, J. Zhang1, Z. Y. Tian1,4, S. H. Fu1, E. J. Liang4, X. C. Wang1,2, Changqing Jin1,2,5, and Jimin Zhao1,2,5* |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3Strong-Field and Ultrafast Photonics Lab, Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China
4School of Physics & Laboratory of Zhongyuan Light, Zhengzhou University, Zhengzhou 450052, China
5Songshan Lake Materials Laboratory, Dongguan 523808, China
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| Cite this article: |
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Litong Jiang, C. Y. Jiang, Y. C. Tian et al 2024 Chin. Phys. Lett. 41 047802 |
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Abstract Ba$_{6}$Cr$_{2}$S$_{10}$ 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 Ba$_{6}$Cr$_{2}$S$_{10}$ single crystal. A prominent change in the photo-excited carrier dynamics is observed at $T_{\rm c}=10$ 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 Ba$_{6}$Cr$_{2}$S$_{10}$, and shed light on phase transitions in TM quantum materials.
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Received: 05 January 2024
Published: 25 April 2024
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