Lattice and magnetic structure in the van der Waals antiferromagnet VBr3
Yimeng Gu, Yiqing Hao, Zeyu Kao, Yiqing Gu, Feiyang Liu, Shiyi Zheng,, Huibo Cao, Lunhua He, Jun Zhao
TL;DR
This study investigates the lattice and magnetic structures of VBr3, revealing antiferromagnetic zigzag order below 26.5 K and symmetry breaking below 94 K using neutron diffraction.
Contribution
It provides the first detailed neutron diffraction analysis of VBr3's magnetic and lattice structures, identifying zigzag antiferromagnetic order and symmetry breaking.
Findings
Antiferromagnetic order appears below 26.5 K.
Magnetic Bragg peaks indexed by k = (0, 0.5, 1).
Peak splitting indicates symmetry breaking below 94 K.
Abstract
We report a comprehensive investigation of the lattice and magnetic structure in van der Waals antiferromagnet VBr3, characterized by a BiI3-type structure at room temperature. Neutron diffraction experiments were performed on both polycrystalline and single-crystalline VBr3 samples, revealing clear magnetic Bragg peaks emerging below the N\'eel temperature of TN = 26.5 K. These magnetic Bragg peaks can be indexed by k = (0, 0.5, 1) in hexagonal notation. Our refinement analysis suggests that the antiferromagnetic order in VBr3 manifests as a zigzag structure. Moreover, we observed peak splitting for nuclear Bragg peaks in the HK-plane below the structure transition temperature of Ts = 94 K, indicating the breaking of 3-fold symmetry within the ab-plane.
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