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Title: High-energy spin waves in the spin-1 square-lattice antiferromagnet La 2 NiO 4

Journal Article · · Physical Review Research

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); Engineering and Physical Sciences Research Council (EPSRC)
Grant/Contract Number:
AC02-76SF00515; AC05-00OR22725; EP/L015544/1; EP/R011141/1
OSTI ID:
1995892
Alternate ID(s):
OSTI ID: 1997662
Journal Information:
Physical Review Research, Journal Name: Physical Review Research Vol. 5 Journal Issue: 3; ISSN 2643-1564
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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