Two-magnon excitations observed by neutron scattering in the two-dimensional spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mstyle scriptlevel="1"><mml:mfrac bevelled="false"><mml:mn>5</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mstyle></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">Rb</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:msub><mml:mi mathvariant="normal">F</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
T. Huberman, Christopher Frost(Science and Technology Facilities Council), Rebecca Christianson(Harvard University), Robert L. Leheny(Johns Hopkins University), R. A. Cowley(University of Oxford), D. M. Tennant(University of Tennessee at Knoxville), R. Coldea(University of Oxford)
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