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Raman-active phonons in R2BaCuO5 (R=La,Nd).

The polarized Raman spectra of tetragonal La 2 BaCuO 5 and Nd 2 BaCuO 5 have been measured in various scattering configurations. The Raman lines corresponding to (3A 1g +1B 1g +3B 2g +3E g ) Raman-active modes expected for the P4/mbm structure have been observed. It has been found that the A 1g and B 2g modes, arising as Davydov's partners from the internal stretching vibrations of oxygen within the CuO 4 structural units, have the same frequencies