Linear spin dynamics of incommensurably modulated magnets |
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Authors: | Stephen W Lovesey |
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Institution: | (1) Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, UK |
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Abstract: | The linear spin dynamics of an incommensurably modulated Heisenberg magnet, with a single-Q structure, is studied using an analytic technique designed to calculate the transverse spin response observed in neutron scattering. Results are presented for a specialQ and also special scattering wave vectors. An approximate expression is proposed that is fully determined by the exchange and anisotropy parameters. The spin response is studied as a function ofQ and shown to be distinctly different from the case in which it is exhausted by a single collective spin oscillation. |
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