Abstract
Optical phonons of mixed-crystal Zn 1-x Mn x Se in both zinc-blende and wurtzite structures are investigated by Raman scattering. A calculation of the compositional dependence of the optical-phonon frequency in Zn 1-x Mn x Se is performed using a modified random-element isodisplacement model with some detailed consideration. It confirms that Zn 1-x Mn x Se shows an intermediate-mode behavior. The constant Θ which describes the effect of variation of the lattice parameter on the force constants should be different for individual mixed crystals
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