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For our SR measurements, polycrystalline pellets of (Cu1-xZnx)GeO3 (x=0, 2, 4 and
8 %) were prepared at the Department of Applied Physics, the University
of Tokyo, using the solid state reactions, starting from a stoichiometric
mixture of CuO, GeO2 and, for the Zn-doped compounds, ZnO .
Powder X-ray measurements could not detect any impurity phase.