Complex spin waves in metallic ferromagnets. II. Finite temperature
- 7 July 1975
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 8 (13) , 2124-2134
- https://doi.org/10.1088/0022-3719/8/13/022
Abstract
For pt.I, see abstr. A30634 of 1973. A study of the spin-wave modes of a metallic ferromagnet, carried out in a previous work for the T=0K case, is extended to the finite-temperature case. The two damped spin-wave branches of poles found in the previous work are shown to persist for finite temperatures, as long as the temperature is small compared with the Fermi temperature. At higher temperatures, the two branches mix and only one important branch is obtained. This structure of branches is shown to result from the existence of two Fermi surfaces (one for each spin) and to be closely related to the Kohn-anomaly points. Conditions of measurability are briefly considered.Keywords
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