Abstract
The temperature dependence of the acoustical and optical branches in ordered ferromagnetic compounds is studied in the Heisenberg model by the Green-function method. For simplicity special attention has been devoted to a b.c.c. crystal. A decoupling procedure which has been successful for simple metals has been used and a T 5 2 behaviour has been predicted both for the optical and acoustical stiffness constant and for the energy gap.
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