| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Finite Temperature Magnetism in the Triangular Lattice Antiferromagnet KErTe$_{2}$ |
| Weiwei Liu1,2†, Zheng Zhang2†*, Dayu Yan2, Jianshu Li2, Zhitao Zhang3, Jianting Ji2, Feng Jin2, Youguo Shi2, and Qingming Zhang2,4 |
1Department of Physics, Renmin University of China, Beijing 100872, China
2Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
4School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
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| Cite this article: |
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Weiwei Liu, Zheng Zhang, Dayu Yan et al 2024 Chin. Phys. Lett. 41 097503 |
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Abstract After the discovery of the ARECh$_{2}$ (A = alkali or monovalent ions, RE = rare-earth, Ch = chalcogen) triangular lattice quantum spin liquid (QSL) family, a series of its oxide, sulfide, and selenide counterparts has been consistently reported and extensively investigated. While KErTe$_{2}$ represents the initial synthesized telluride member, preserving its triangular spin lattice, it was anticipated that the substantial tellurium ions could impart more pronounced magnetic attributes and electronic structures to this material class. This study delves into the magnetism of KErTe$_{2}$ at finite temperatures through magnetization and electron spin resonance (ESR) measurements. Based on the angular momentum $\hat{J}$ after spin-orbit coupling (SOC) and symmetry analysis, we obtain the magnetic effective Hamiltonian to describe the magnetism of Er$^{3+}$ in $R\bar{3}m$ space group. Applying the mean-field approximation to the Hamiltonian, we can simulate the magnetization and magnetic heat capacity of KErTe$_{2}$ in paramagnetic state and determine the crystalline electric field (CEF) parameters and partial exchange interactions. The relatively narrow energy gaps between the CEF ground state and excited states exert a significant influence on the magnetism. For example, small CEF excitations can result in a significant broadening of the ESR linewidth at 2 K. For the fitted exchange interactions, although the values are small, given a large angular momentum $J=15/2$ after SOC, they still have a noticeable effect at finite temperatures. Notably, the heat capacity data under different magnetic fields along the $c$ axis direction also roughly match our calculated results, further validating the reliability of our analytical approach. These derived parameters serve as crucial tools for future investigations into the ground state magnetism of KErTe$_{2}$. The findings presented herein lay a foundation for exploration of the intricate magnetism within the triangular-lattice delafossite family.
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Received: 11 June 2024
Published: 19 September 2024
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| PACS: |
75.10.Kt
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(Quantum spin liquids, valence bond phases and related phenomena)
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75.30.Et
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(Exchange and superexchange interactions)
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75.30.Gw
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(Magnetic anisotropy)
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