Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910345163964416 |
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| author | Chen, Lebing Teng, Xiaokun Hu, Ding Ye, Feng Granroth, Garrett E. Yi, Ming Chung, Jae-Ho Birgeneau, Robert J. Dai, Pengcheng |
| author_facet | Chen, Lebing Teng, Xiaokun Hu, Ding Ye, Feng Granroth, Garrett E. Yi, Ming Chung, Jae-Ho Birgeneau, Robert J. Dai, Pengcheng |
| contents | We use elastic and inelastic neutron scattering (INS) to study the antiferromagnetic (AF) phase transitions and spin excitations in the two-dimensional (2D) zig-zag antiferromagnet FePSe$_3$. By determining the magnetic order parameter across the AF phase transition, we conclude that the AF phase transition in FePSe$_3$ is first-order in nature. In addition, our INS measurements reveal that the spin waves in the AF ordered state have a large easy-axis magnetic anisotropy gap, consistent with an Ising Hamiltonian, and possible biquadratic magnetic exchange interactions. On warming across $T_N$, we find that dispersive spin excitations associated with three-fold rotational symmetric AF fluctuations change into FM spin fluctuations above $T_N$. These results suggest that the first-order AF phase transition in FePSe$_3$ may arise from the competition between $C_3$ symmetric AF and $C_1$ symmetric FM spin fluctuations around $T_N$, in place of a conventional second-order AF phase transition. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_16983 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3 Chen, Lebing Teng, Xiaokun Hu, Ding Ye, Feng Granroth, Garrett E. Yi, Ming Chung, Jae-Ho Birgeneau, Robert J. Dai, Pengcheng Strongly Correlated Electrons We use elastic and inelastic neutron scattering (INS) to study the antiferromagnetic (AF) phase transitions and spin excitations in the two-dimensional (2D) zig-zag antiferromagnet FePSe$_3$. By determining the magnetic order parameter across the AF phase transition, we conclude that the AF phase transition in FePSe$_3$ is first-order in nature. In addition, our INS measurements reveal that the spin waves in the AF ordered state have a large easy-axis magnetic anisotropy gap, consistent with an Ising Hamiltonian, and possible biquadratic magnetic exchange interactions. On warming across $T_N$, we find that dispersive spin excitations associated with three-fold rotational symmetric AF fluctuations change into FM spin fluctuations above $T_N$. These results suggest that the first-order AF phase transition in FePSe$_3$ may arise from the competition between $C_3$ symmetric AF and $C_1$ symmetric FM spin fluctuations around $T_N$, in place of a conventional second-order AF phase transition. |
| title | Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2402.16983 |