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- Title
Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe<sub>3</sub>.
- Authors
Chen, Lebing; Teng, Xiaokun; Hu, Ding; Ye, Feng; Granroth, Garrett E.; Yi, Ming; Chung, Jae-Ho; Birgeneau, Robert J.; Dai, Pengcheng
- 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 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.
- Subjects
SPIN excitations; ANTIFERROMAGNETIC materials; SPIN waves; FIRST-order phase transitions; PHASE transitions; INELASTIC neutron scattering; HONEYCOMB structures; MAGNETIC entropy
- Publication
NPJ Quantum Materials, 2024, Vol 9, Issue 1, p1
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-024-00651-5