Abstract
A model of KDP proposed by Kobayashi (1968), in which proton pseudo-spins are bilinearly coupled in the Hamiltonian to transverse optic phonon operators, is extended, following earlier authors, to include a similar coupling to acoustic modes plus a magnetostrictive dependence of pseudo-spin exchange on longitudinal acoustic vibrations associated with lattice parameter fluctuations. This provides a damping mechanism for propagating modes omega 1(q) and omega 3(q) having optic and acoustic character, respectively. Imaginary parts of the mode frequencies are extracted from the poles of the spin Green function, which is calculated by the equation-of-motion method, with random phase decoupling, for T>Tc.
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