Magnetic properties of van der Waals layered single crystals DyOBr and SmOCl
Abstract
Two-dimensional van der Waals single crystals DyOBr and SmOCl have been grown by flux method and their anisotropic magnetic properties are reported. DyOBr orders antiferromagnetically at TN=9.5 K with magnetic moments lying along a-axis, similar as DyOCl. Its magnetic susceptibility shows an anomaly at T*=30 K possibly due to the crystal field effect. Furthermore a 1/3 magnetization plateau is clearly observed under H and H[110], which might be a field-induced spin-flop phase or some exotic quantum magnetic state. On the other hand, isostructural SmOCl undergoes an antiferromagnetic transition at TN=7.1 K and exhibits a contrasting Ising-like perpendicular c-axis magnetic anisotropy, which could be well explained by our crystal field calculations. Both DyOBr and SmOCl are insulators with band gap of 5 eV, our results suggest they are promising in building van der Waals heterostructures and applications in multifunctional devices.
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