Oxygen vibrations in the series Bi2Sr2Can-1CunO4+2n+y

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Abstract
We present a discussion of the oxygen vibrations in the Bi2Sr2Can-1CunO4+2n+y high Tc superconductors with the aim of interpreting Raman spectra in the case of the non-symmorphic Amaa structure. Group theory shows that the oxygen atoms belonging to the central CuO2 plane generate a Raman activity for the n=1,3 phases. Consequently, we propose a novel assignment for the lines of weak intensity at 297, 316 and 333 cm-1. It is shown that the two components of the 460 cm-1 band may be consistent with the Amma structure. Spectra recorded in crossed polarization exhibit weak lines which could be assigned to B 1g modes expected for the three phases

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