Spin-Wave Lifetimes Throughout the Brillouin Zone

Details Spin-Wave Lifetimes Throughout the Brillouin Zone Spin-Wave Lifetimes Throughout the Brillouin Zone

2006-06-30

arxiv.org/abs/cond-mat/0606814v1

Science 312, 1926 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 4 figures

Scientific paper

10.1126/science.1127756

We use a neutron spin-echo method with $\mu$eV resolution to determine the lifetimes of spin waves in the prototypical antiferromagnet MnF$_2$ over the entire Brillouin zone. A theory based on the interaction of magnons with longitudinal spin fluctuations provides an excellent, parameter-free description of the data, except at the lowest momenta and temperatures. This is surprising, given the prominence of alternative theories based on magnon-magnon interactions in the literature. The results and technique open up a new avenue for the investigation of fundamental concepts in magnetism. The technique also allows measurement of the lifetimes of other elementary excitations (such as lattice vibrations) throughout the Brillouin zone.

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