Spin waves in multiple-spin-density-wave systems
作者： M W Long , W Yeung
DOI: 10.1088/0022-3719/19/9/012
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摘要: The spin wave modes in an anisotropic Heisenberg model are investigated for a triple-spin-density-wave (TSDW) ground state FCC lattice. Explicit solutions obtained the diagonal-exchange regime all directions. also given (0,0, xi ) and ( , ,0) directions above including non-diagonal exchange crystal-field term. Besides usual acoustic authors find mode with dispersion similar to that of ferromagnetic wave. This latter couples weakly neutrons. They obtain qualitatively different results Jensen Bak (1981) who appear drop off-diagonal-exchange terms. compare between TSDW those due distribution single spin-density waves (SSDW) polarised along each axis discuss their effect on width measurements.
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