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Spin-Wave Lifetimes Throughout the Brillouin Zone | | S.P. Bayrakci
; T. Keller
; K. Habicht
; B. Keimer
; | | Date: |
30 Jun 2006 | | Journal: | Science 312, 1926 (2006) | | Subject: | Strongly Correlated Electrons | | Abstract: | 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. | | Source: | arXiv, cond-mat/0606814 | | Services: | Forum | Review | PDF | Favorites | |
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