High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4

A. N. Petsch; N. S. Headings; D. Prabhakaran; A. I. Kolesnikov; C. D. Frost; A. T. Boothroyd; R. Coldea; S. M. Hayden

doi:10.1103/PhysRevResearch.5.033113

High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4

A. N. Petsch, N. S. Headings, D. Prabhakaran, A. I. Kolesnikov, C. D. Frost, A. T. Boothroyd, R. Coldea, S. M. Hayden

Direct Geometry

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Abstract

Inelastic neutron scattering is used to study the magnetic excitations of the S=1 square-lattice antiferromagnet La2NiO4. 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 La2NiO4. 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.

Original language	English
Article number	033113
Journal	Physical Review Research
Volume	5
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevResearch.5.033113
State	Published - Jul 2023

Funding

The authors would like to thank Ruben Verresen, Roderich Moessner, and James Annett for useful discussions. A.N.P. and S.M.H. acknowledge funding and support from the Engineering and Physical Sciences Research Council (EPSRC) under Grants No. EP/L015544/1 and No. EP/R011141/1. Beam time at ISIS and SNS were provided under Proposals No. RB920380 and No. 26529.1, respectively. A portion of this research used resources at the Spallation Neutron Source, a U.S. Department of Energy Office of Science User Facility operated by the Oak Ridge National Laboratory. A.N.P. acknowledges support from the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-76SF00515. R.C. acknowledges support from the European Research Council under the European Union's Horizon 2020 Research and Innovation Programme Grant Agreement No. 788814 (EQFT).

Funders	Funder number
EQFT
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering	DE-AC02-76SF00515
Engineering and Physical Sciences Research Council	RB920380, 26529.1, EP/R011141/1, EP/L015544/1
European Research Council
Horizon 2020	788814

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title = "High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4",

abstract = "Inelastic neutron scattering is used to study the magnetic excitations of the S=1 square-lattice antiferromagnet La2NiO4. 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 La2NiO4. 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.",

author = "Petsch, {A. N.} and Headings, {N. S.} and D. Prabhakaran and Kolesnikov, {A. I.} and Frost, {C. D.} and Boothroyd, {A. T.} and R. Coldea and Hayden, {S. M.}",

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AU - Petsch, A. N.

AU - Headings, N. S.

AU - Prabhakaran, D.

AU - Kolesnikov, A. I.

AU - Frost, C. D.

AU - Boothroyd, A. T.

AU - Coldea, R.

AU - Hayden, S. M.

N1 - Publisher Copyright: © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2023/7

Y1 - 2023/7

N2 - Inelastic neutron scattering is used to study the magnetic excitations of the S=1 square-lattice antiferromagnet La2NiO4. 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 La2NiO4. 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.

AB - Inelastic neutron scattering is used to study the magnetic excitations of the S=1 square-lattice antiferromagnet La2NiO4. 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 La2NiO4. 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.

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High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4

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