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).


Published in:
Journal of Magnetism and Magnetic Materials, 272-76, 896-897
Year:
2004
ISSN:
0304-8853
Keywords:
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
Laboratories:




 Record created 2007-01-24, last modified 2018-03-17


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