Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3.

Autor:	Chen, Lebing, Teng, Xiaokun, Hu, Ding, Ye, Feng, Granroth, Garrett E., Yi, Ming, Chung, Jae-Ho, Birgeneau, Robert J., Dai, Pengcheng
Předmět:	SPIN excitations ANTIFERROMAGNETIC materials SPIN waves FIRST-order phase transitions PHASE transitions INELASTIC neutron scattering HONEYCOMB structures MAGNETIC entropy
Zdroj:	NPJ Quantum Materials; 5/13/2024, Vol. 9 Issue 1, p1-7, 7p
Abstrakt:	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. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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