Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3

Lebing Chen; Xiaokun Teng; Ding Hu; Feng Ye; Garrett E. Granroth; Ming Yi; Jae Ho Chung; Robert J. Birgeneau; Pengcheng Dai

doi:10.1038/s41535-024-00651-5

Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe₃

Lebing Chen^*
, Xiaokun Teng
, Ding Hu
, Feng Ye
, Garrett E. Granroth
, Ming Yi
, Jae Ho Chung^*
, Robert J. Birgeneau^*
, Pengcheng Dai^*

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

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 T_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 C₃ symmetric AF and C₁ symmetric FM spin fluctuations around T_N, in place of a conventional second-order AF phase transition.

Original language	English
Article number	40
Journal	npj Quantum Materials
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41535-024-00651-5
Publication status	Published - 2024 Dec

Bibliographical note

Publisher Copyright:
© The Author(s) 2024.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1038/s41535-024-00651-5

Cite this

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title = "Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3",

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.",

author = "Lebing Chen and Xiaokun Teng and Ding Hu and Feng Ye and Granroth, \{Garrett E.\} and Ming Yi and Chung, \{Jae Ho\} and Birgeneau, \{Robert J.\} and Pengcheng Dai",

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T1 - Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3

AU - Chen, Lebing

AU - Teng, Xiaokun

AU - Hu, Ding

AU - Ye, Feng

AU - Granroth, Garrett E.

AU - Yi, Ming

AU - Chung, Jae Ho

AU - Birgeneau, Robert J.

AU - Dai, Pengcheng

PY - 2024/12

Y1 - 2024/12

N2 - 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.

AB - 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.

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