Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3

IF 5.4 1区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Quantum Materials Pub Date : 2024-05-13 DOI:10.1038/s41535-024-00651-5

Lebing Chen, Xiaokun Teng, Ding Hu, Feng Ye, Garrett E. Granroth, Ming Yi, Jae-Ho Chung, Robert J. Birgeneau, Pengcheng Dai

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Abstract

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 FePSe₃. By determining the magnetic order parameter across the AF phase transition, we conclude that the AF phase transition in FePSe₃ 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 FePSe₃ may arise from the competition between C₃ symmetric AF and C₁ symmetric FM spin fluctuations around T_N, in place of a conventional second-order AF phase transition.

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蜂窝状 Ising 反铁磁性 FePSe3 中自旋激发的热演化

我们利用弹性和非弹性中子散射（INS）来研究二维（2D）之字形反铁磁体 FePSe3 中的反铁磁（AF）相变和自旋激发。通过确定反铁磁相变的磁序参数，我们得出结论：FePSe3 中的反铁磁相变具有一阶性质。此外，我们的 INS 测量显示，AF 有序态中的自旋波具有较大的易轴磁各向异性间隙，这与伊辛哈密顿和可能的双四磁交换相互作用相一致。当温度升高到 TN 以上时，我们发现与三重旋转对称 AF 波动相关的色散自旋激发会转变为 TN 以上的调频自旋波动。这些结果表明，FePSe3 中的一阶 AF 相变可能来自 TN 附近 C3 对称 AF 和 C1 对称 FM 自旋波动之间的竞争，而不是传统的二阶 AF 相变。

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来源期刊

npj Quantum Materials Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

10.60

自引率

3.50%

发文量

107

审稿时长

6 weeks

期刊介绍： npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.