Abstract
Micro-Raman measurements under hydrostatic pressures up to ~6 GPa have been carried out on high-quality La2-xSrxCuO4 polycrystalline compounds with Sr concentration up to x = 0.24. The zz scattering polarization has been investigated at room temperature, where two strong modes due to La/Sr and the apex oxygen atoms are observed. The energy of the strong modes increases almost linearly with pressure for the Sr concentrations studied. Modifications in the increment rate dω/dp have been detected depending on the amount of doping. Finally, measurements at low temperatures denote that the application of pressure minimizes the distortions of the CuO6 octahedra.
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