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).
Title
Deviations from linear spin wave theory in the 2D, S=1/2 Heisenberg antiferromagnet CFTD
Published in
Journal of Magnetism and Magnetic Materials
Volume
272-76
Pages
896-897
Date
2004
ISSN
0304-8853
Note
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. niels.b.christensen@risoe.dk
Record creation date
2007-01-24