Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3

Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3

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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 Independent association of general and central adiposity with risk of gallstone disease: observational and genetic analyses 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 Impact of the digital economy on the development of economic systems 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 C 3 symmetric AF and C 1 symmetric FM spin fluctuations around T N, in place of a conventional second-order AF phase transition.