Raman spectra of superconducting and non-superconducting phase of Nd2−xCexCuO4

Abstract The phonon Raman spectra of Nd 2- x Ce x CuO 4 polycrystals before and after reduction were investigated. After the reduction, the frequencies for phonon Raman peaks at 125 cm -1 and 230 cm -1 associated with the vibration of Nd(Ce) ions changed, and the peak at 582 cm -1 possibly associated with the vibration of O(1,2) and Cu in the CuO 2 -plane sharpened. Some concise discussions about the results are given.