Abstract
The phonon spectrum and the elastic constants of high superconducting transition temperature compound Ba2YCu3O7 have been investigated in both the tetragonal and the orthorhombic phases using an angular force model. The zone centre phonons agree well with the Raman and the infra-red measurements in the case of tetragonal phase as compared to the orthorhombic one. The acoustical phonons exhibit phonon anomalies in both the tetragonal and the orthorhombic structures. Number of optical phonons do not show dispersion in [ooq] direction indicating strong 2-dimensional features. The relevance of the phonons to the high temperature superconductivity is discussed. The elastic constants do not indicate anisotropy in either of the tetragonal or the orthorhombic phases.
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