Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
79 (1996), S. 4824-4826
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The spin excitations about the two incommensurate wavevectors of the spin-density-wave (SDW) state in Cr are studied for the first time within the random-phase approximation. Transverse spin-wave (SW) modes and longitudinal phason modes are associated with the rotational and translational symmetries of Cr. While both mode frequencies vanish at the SDW ordering wavevectors, only the SW mode with linear dispersion and mode velocity c=vF/(square root of)3 is undamped for nonzero frequencies. As in a local-moment system, the SW mode corresponds to the rigid rotation of the local magnetic moments. The phason modes have a nearly linear dispersion at low frequencies with velocity cph〈c. As T approaches TN, cph approaches c. Phason modes have been observed in the longitudinally polarized SDW state below 120 K in pure Cr and are responsible for a 60 meV peak in the cross sections midway between the satellites. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.361620
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