Chin. Phys. Lett.  2021, Vol. 38 Issue (9): 096101    DOI: 10.1088/0256-307X/38/9/096101
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Magnetic Order and Its Interplay with Structure Phase Transition in van der Waals Ferromagnet VI$_{3}$
Yiqing Hao1†, Yiqing Gu1,2†, Yimeng Gu1,2, Erxi Feng3, Huibo Cao3, Songxue Chi3, Hua Wu4,1,2, and Jun Zhao1,2,5,6*
1State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
2Shanghai Qi Zhi Institute, Shanghai 200232, China
3Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
4Laboratory for Computational Physical Sciences (MOE), Fudan University, Shanghai 200433, China
5Institute of Nanoelectronics and Quantum Computing, Fudan University, Shanghai 200433, China
6 Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
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Yiqing Hao, Yiqing Gu, Yimeng Gu et al  2021 Chin. Phys. Lett. 38 096101
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Abstract Van der Waals magnet VI$_{3}$ demonstrates intriguing magnetic properties that render it great for use in various applications. However, its microscopic magnetic structure has not been determined yet. Here, we report neutron diffraction and susceptibility measurements in VI$_{3}$ that revealed a ferromagnetic order with the moment direction tilted from the $c$-axis by $\sim $$36^{\circ}$ at 4 K. A spin reorientation accompanied by a structure distortion within the honeycomb plane is observed, before the magnetic order completely disappears at $T_{\rm C} = 50$ K. The refined magnetic moment of $\sim $$1.3 \mu_{\scriptscriptstyle {\rm B}}$ at 4 K is much lower than the fully ordered spin moment of $2\mu_{\scriptscriptstyle {\rm B}}$/V$^{3+}$, suggesting the presence of a considerable orbital moment antiparallel to the spin moment and strong spin–orbit coupling in VI$_{3}$. This results in strong magnetoelastic interactions that make the magnetic properties of VI$_{3}$ easily tunable via strain and pressure.
Received: 14 July 2021      Express Letter Published: 16 August 2021
PACS:  61.05.F- (Neutron diffraction and scattering)  
  71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)  
  75.25.+z  
  75.30.Gw (Magnetic anisotropy)  
Fund: Supported by the Innovation Program of Shanghai Municipal Education Commission (Grant No. 2017–01-07-00-07-E00018), the Shanghai Municipal Science and Technology Major Project (Grant No. 2019SHZDZX01), and the National Natural Science Foundation of China (Grant No. 11874119). E.F. and H.C. acknowledge the support of U.S. DOE BES Early Career Award No. KC0402020 under Contract No. DE-AC05-00OR22725.
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http://cpl.iphy.ac.cn/10.1088/0256-307X/38/9/096101       OR      http://cpl.iphy.ac.cn/Y2021/V38/I9/096101
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Yiqing Hao
Yiqing Gu
Yimeng Gu
Erxi Feng
Huibo Cao
Songxue Chi
Hua Wu
and Jun Zhao
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