Deviations from linear spin wave theory in the 2D, S=1/2 Heisenberg antiferromagnet CFTD
The 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).
Riso Natl Lab, Mat Res Dept, DK-4000 Roskilde, Denmark. CEA, F-38054 Grenoble 9, France. Univ Edinburgh, Dept Chem, Edinburgh EH8 9YL, Midlothian, Scotland. Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England. Clarendon Lab, Oxford, England. Christensen, NB, Riso Natl Lab, Mat Res Dept, DK-4000 Roskilde, Denmark. email@example.com
Record created on 2007-01-24, modified on 2016-08-08