DETERMINATION OF THE PHASE DIFFERENCE BETWEEN THE RAMAN TENSOR ELEMENTS OF THE A(1G)-LIKE PHONONS IN SMBA2CU3O7-DELTA

We describe a general method to determine the relative phase differenc e between the complex components of a phononic Raman tensor from the m easured angular dependence of the intensity of light scattered inelast ically by the phonon in a Raman process. The method is applied to Rama n spectra of a (110)-oriented SmBa2Cu3O7-delta thin film obtained at r oom temperature. From our spectra we derive for the A(lg)-like phonons the anisotropy ratio and the relative phase difference between the tw o independent components of the Ramon tensor as a function of laser en ergy (h) over bar omega. We point out that our results can be used to verify theoretical calculations of Raman tensors and compare our data with values calculated for the related compound YBa2Cu4O8.