Abstract
CuGeO 3 is an inorganic compound which possesses a spin-Peierls transition. We have studied the crystal structure and the phonon dynamics of CuGeO 3 by neutron scattering. We found that a lattice anomaly starts to evolve significantly above the transition temperature, T sp, and there is a drastic change below T sp. The phonon mode over a wide energy range changes drastically at high temperature. Therefore we conclude that the inherent structural instability in the crystal structure provides favorable conditions for the lattice-spin interaction and induces the spin-Peierls transition, i.e. lattice dimerization.
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