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Creators/Authors contains: "Hu, Ding"

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  1. ; ; ; ; ; ; ; ; (, npj Quantum Materials)
    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 FePSe3is 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 acrossTN, we find that dispersive spin excitations associated with three-fold rotational symmetric AF fluctuations change into FM spin fluctuations aboveTN. These results suggest that the first-order AF phase transition in FePSe3may arise from the competition betweenC3symmetric AF andC1symmetric FM spin fluctuations aroundTN, in place of a conventional second-order AF phase transition. 
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  2. ; ; ; ; ; ; ; ; ; ; et al (, Nano Letters)
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  3. ; ; ; ; ; ; ; (, Physical Review B)
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  5. ; ; ; ; ; ; ; ; ; ; et al (, npj Quantum Materials)
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  6. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review B)