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Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3
npj Quantum Materials ( IF 5.4 ) 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

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 TN, we find that dispersive spin excitations associated with three-fold rotational symmetric AF fluctuations change into FM spin fluctuations above TN. 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 TN, in place of a conventional second-order AF phase transition.



中文翻译:

蜂窝状伊辛反铁磁 FePSe3 中自旋激发的热演化

我们使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 FePSe 3中的反铁磁(AF)相变和自旋激发。通过确定 AF 相变的磁序参数,我们得出结论,FePSe 3中的 AF 相变本质上是一阶的。此外,我们的 INS 测量表明,AF 有序态的自旋波具有较大的易轴磁各向异性间隙,与伊辛哈密顿量一致,并且可能存在双二次磁交换相互作用。当T N变暖时,我们发现与三倍旋转对称 AF 波动相关的色散自旋激发转变为高于T N 的FM 自旋波动。这些结果表明,FePSe 3中的一阶AF相变可能是由C 3对称AF和C 1对称FM自旋波动围绕T N之间的竞争产生的,而不是传统的二阶AF相变。

更新日期:2024-05-14
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