A novel monoclinic phase and electrically tunable magnetism of van der Waals layered magnet CrTe2  

作　　者：任启迪 赖康 陈家浩 余晓翔 戴佳钰 Qidi Ren;Kang Lai;Jiahao Chen;Xiaoxiang Yu;Jiayu Dai(Department of Physics,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]Department of Physics,National University of Defense Technology,Changsha 410073,China

出　　处：《Chinese Physics B》2023年第2期436-441,共6页中国物理B（英文版）

基　　金：supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403200);the National Natural Science Foundation of China (Grant No. 11774429);the NSAF (Grant No. U1830206);the Science and Technology Innovation Program of Hunan Province, China (Grant No. 2021RC4026)。

摘　　要：Exploring the novel structural phase of van der Waals(vdW) magnets would promote the development of spintronics.Here, through first-principles calculations, we report a novel monoclinic structure of vdW layered 1T-CrTe2, which is one of the popular vdW magnets normally exhibiting a trigonal structure. The new monoclinic phase emerges from a switchable magnetic state between ferromagnetism and antiferromagnetism through changing hole doping concentration, which suggests a practical approach to obtain such a structure. The results of phonon dispersion and energy analysis convince us that the monoclinic structure is a metastable phase even without hole doping. When the hole doping concentration increases,the stability analysis indicates the preference for a novel monoclinic phase rather than a conventional trigonal phase, and meanwhile, the magnetic properties are accordingly tuned. This work provides new insights into the phase engineering of the chalcogenide family and the electrical control of magnetism of vdW layered magnets.

关 键 词：van der Waals magnets magnetic transition hole doping 

分 类 号：O469[理学—凝聚态物理]