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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 |
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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.
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Received: 11 February 2021
Revised: 08 March 2021
Accepted manuscript online: 24 May 2021
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PACS:
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75.80.+q
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(Magnetomechanical effects, magnetostriction)
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78.30.-j
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(Infrared and Raman spectra)
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63.20.-e
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(Phonons in crystal lattices)
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96.15.Gh
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(Magnetic field and magnetism)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U2032213, U1832214, and 11774352). |
Corresponding Authors:
Zhe Qu
E-mail: zhequ@hmfl.ac.cn
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Cite this article:
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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