Christensen, N. B.McMorrow, D. F.Ronnow, H. M.Harrison, A.Perring, T. G.Coldea, R.2007-01-242007-01-242007-01-24200410.1016/j.jmmm.2004.01.056https://infoscience.epfl.ch/handle/20.500.14299/239948The spin excitation spectrum in the 2D square lattice Heisenberg antiferromagnet CFTD has been investigated using time-of-flight neutron scattering. The magnon dispersion and intensities have been determined as a function of wavevector Q in the full Brillouin zone. Both quantities are found to deviate significantly from the predictions of linear spin wave theory for wavevectors in the vicinity of Q = (pi, 0), whereas good agreement is found near Q = (pi/2, pi/2).antiferroinagnetismspin waveSQUARE LATTICEtext::journal::journal article::research article