Abstract
A spin-Peierls gap excitation is observed in the first-order Raman process in Zn- and Si-doped CuGeO 3, because the selection rule is broken. It shifts to lower frequency together with its line broadening as the dopant concentration is increased. The two-magnetic-excitation bound state changes into a resonant state and disappears with increasing dopant concentration, mainly due to the shortening of the lifetime of magnetic excitation. These features are demonstrated theoretically by using a Green's function.
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