Abstract
Low frequency E ( x , y )-mode Raman spectrum of a KH 2 PO 4 crystal is discussed in terms of the pseudo-spin model extended by Havlin et al. to the problem of transverse susceptibility. Temperature dependence of the susceptibility obtained from the integrated intensity of a broad continuum of the Raman spectrum can be well interpreted by their theory. The theory indicates that this mode, just like the B 2 ( z )-soft phonon mode, originates from a zone-center phonon corresponding to a collective proton motion in the a - b plane. Dynamics of the E -mode is also discussed in the framework of the pseudo-spin formalism and it is shown that this model is applicable not only to B 2 ( z ) soft mode but also, at least qualitatively, to the E ( x , y ) mode in spite of the apparently different behaviour of the two modes with respest to the phase transition.
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