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

Physical Review B, ISSN: 0163-1829, Vol: 47, Issue: 13, Page: 8320-8323
1993
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The polarized Raman spectra of tetragonal La2BaCuO5 and Nd2BaCuO5 have been measured in various scattering configurations. The Raman lines corresponding to (3A1g+1B1g+3B2g+3Eg) Raman-active modes expected for the P4/mbm structure have been observed. It has been found that the A1g and B2g modes, arising as Davydov's partners from the internal stretching vibrations of oxygen within the CuO4 structural units, have the same frequencies. This justifies the molecular-site group analysis used parallel to the factor-group analysis to assign the particular phonon lines to definite atomic vibrations. © 1993 The American Physical Society.

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