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• W4385978063 abstract "Inelastic neutron scattering is used to study the magnetic excitations of the $S=1$ square-lattice antiferromagnet ${mathrm{La}}_{2}{mathrm{NiO}}_{4}$. We find that the spin waves cannot be described by a simple classical (harmonic) Heisenberg model with only nearest-neighbor interactions. The spin-wave dispersion measured along the antiferromagnetic Brillouin-zone boundary shows a minimum energy at the $(1/2,0)$ position as is observed in some $S=1/2$ square-lattice antiferromagnets. Thus, our results suggest that the quantum dispersion renormalization effects or longer-range exchange interactions observed in cuprates and other $S=1/2$ square-lattice antiferromagnets are also present in ${mathrm{La}}_{2}{mathrm{NiO}}_{4}$. We also find that the overall intensity of the spin-wave excitations is suppressed relative to linear spin-wave theory, indicating that covalency is important. Two-magnon scattering is also observed." @default.
• W4385978063 created "2023-08-19" @default.
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• W4385978063 date "2023-08-18" @default.
• W4385978063 modified "2023-10-06" @default.
• W4385978063 title "High-energy spin waves in the spin-1 square-lattice antiferromagnet <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>NiO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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• W4385978063 doi "https://doi.org/10.1103/physrevresearch.5.033113" @default.
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