Abstract
ESR and Raman spectra were studied for YBa2(Cu1-xMnx)3O7-y. Among Raman active phonon modes, only the 440 cm-1 mode was found to depend on the Mn content. The two-magnon peak is shifted to the lower frequency side by the addition of Mn. These facts indicate that Mn ions preferentially occupy the site of Cu in the CuO2 plane. The ESR signal originating from antiferromagnetically interacting Mn ions in phase-separated clusters was obtained in all the Mn-doped samples. Both the Mn content dependences of the ESR intensity and the lattice constant show that the content of Mn ions in the CuO2 plane is saturated with an increase in the Mn content above x>0.05.
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