Abstract
The g -shifts in spin-Peierls (SP) and magnetic (M) phases of the inorganic spin-Peierls material CuGeO 3 have been observed by submillimeter wave ESR. The temperature dependence of the g -shifts from U phase to SP or M phase showed a continuous change. Since such g -shifts were also observed in the organic spin-Peierls material, for example TTF-AuBDT, such g -shifts can be considered the universal phenomena due to the lattice distortion in the spin-Peierls materials. But, in the case of CuGeO 3 , the g -shifts are so large that we cannot explain them in the framework of the point charge model with considering the continuous lattice distortion.
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