Spin-phonon coupling in van der Waals antiferromagnet VOCl
Wen-Jun Wang(王文君)1,2, Xi-Tong Xu(许锡童)1,3, Jie Shen(沈洁)1,2, Zhe Wang(王哲)1,2, Shi-Le Zhang(张仕乐)1, and Zhe Qu(屈哲)1,3,†
1 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China; 2 Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China; 3 CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China
Abstract We report magnetization and Raman spectroscopy study on single crystals of VOCl, a van der Waals antiferromagnetic material. Magnetization measurement confirms an antiferromagnetic transition at 79 K and a magnetic easy axis along crystallographic a direction. The temperature-dependent Raman spectrum reveals five peaks at 30 K. Below the Neel temperature TN, the Raman-active modes 247 cm-1 and 404 cm-1 remarkably deviate from the standard Boltzmann function, which is ascribed to the strong magnetoelastic coupling between spins and phonons. We further observe an anomaly in 383 cm-1 mode at around 150 K. This coincides with the broad maximum in VOCl's magnetic susceptibility, suggesting a development of short-ranged magnetic order at this temperature.
Wen-Jun Wang(王文君), Xi-Tong Xu(许锡童), Jie Shen(沈洁), Zhe Wang(王哲), Shi-Le Zhang(张仕乐), and Zhe Qu(屈哲) Spin-phonon coupling in van der Waals antiferromagnet VOCl 2021 Chin. Phys. B 30 107502
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