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We have explored the magnetic excitation spectrum of the S=1/2 square latticeHeisenberg antiferromagnet, K2V3O8 using both triple-axis and time-of-flightinelastic neutron scattering. The long-wavelength spin waves are consistentwith the previously determined Hamiltonian for this material. A small energygap of 72+/-9 micro-eV is observed at the antiferromagnetic zone center and thenear-neighbor exchange constant is determined to be 1.08+/-0.03 meV. A finiteferromagnetic interplanar coupling is observed along the crystallographicc-axis with a magnitude of Jc=-0.0036+/-0.006 meV. However, upon approachingthe zone boundary, the observed excitation spectrum deviates significantly fromthe expectation of linear spin wave theory resulting in split modes at the(pi/2,pi/2) zone boundary point. The effects of magnon-phonon interaction,orbital degrees of freedom, multimagnon scattering, and dilution/siterandomness are considered in the context of the mode splitting. Unfortunately,no fully satisfactory explanation of this phenomenon is found and furthertheoretical and experimental work is needed.Comment: 15 pages, 13 figures, submitted to Physical Review

physical review. b, condensed matter and materials physics

Magnetic excitation spectrum of the square lattice<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>Heisenberg antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">K</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">V</…

Magnetic excitation spectrum of the square latticeS=1∕2Heisenberg antiferromagnetK2V