| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetism and magnetic anisotropy in Nb3Cl8 revealed by electron spin resonance |
| Ubaid Raza1,2, Zhijie Ma(马之杰)1, Fangwei Wang(王芳卫)1,2, Youguo Shi(石友国)1, Lunhua He(何伦华)1,2, and Liqin Yan(闫丽琴)1,2,† |
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China |
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Abstract This study investigates the microscopic spin dynamics and anisotropic magnetic behavior in van der Waals kagome magnet Nb$_3$Cl$_8$ by employing electron spin resonance (ESR) spectroscopy on both powder and single-crystal samples over the temperature range of 5 K-300 K. The effective $g$, peak to peak linewidths ($\Delta H_{\rm pp}$), and double integrated intensities ($I$) were extracted from the ESR spectra to analyze the temperature-dependent evolution of spin-orbit coupling and spin-spin interactions. The formation of singlet ground state in single crystal Nb$_3$Cl$_8$ at $T^*\sim100$ K is observed, evidenced by the maximum $\Delta H_{\rm pp}$ and $g$ at $T^*$, along with the decrease in intensity $I$, which is consistent to the reported non-magnetic transition in the single-crystal Nb$_3$Cl$_8$. Moreover, the spectral difference between $H\parallel c$ and $H\bot c$ configurations imply subtle magnetic anisotropy in single crystal Nb$_3$Cl$_8$. However, there is no non-magnetic transition was observed in powder Nb$_3$Cl$_8$ since the parameters of $\Delta H_{\rm pp}$ and $I$ keep stable at $T^*$. It might be attributed to the grain averaging and random orientation effects. Our study provides valuable insights into the magnetic interplay in Nb$_3$Cl$_8$ and prove the potential of ESR spectroscopy as a powerful tool for probing the intrinsic magnetism.
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Received: 04 August 2025
Revised: 17 October 2025
Accepted manuscript online: 30 October 2025
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PACS:
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76.30.-v
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(Electron paramagnetic resonance and relaxation)
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71.70.Ej
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(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
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76.60.Es
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(Relaxation effects)
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75.30.Gw
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(Magnetic anisotropy)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 52088101, 12174425, and U23A20550). |
Corresponding Authors:
Liqin Yan
E-mail: lqyan@iphy.ac.cn
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Cite this article:
Ubaid Raza, Zhijie Ma(马之杰), Fangwei Wang(王芳卫), Youguo Shi(石友国), Lunhua He(何伦华), and Liqin Yan(闫丽琴) Magnetism and magnetic anisotropy in Nb3Cl8 revealed by electron spin resonance 2026 Chin. Phys. B 35 057601
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