Raman Study in Pr 0.5 Ca 0.5 MnO 3 Thin Films
A. Tatsi a , E.L. Papadopoulou a , D. Lampakis a , E. Liarokapis a , W. Prellier b and B. Mercey b
a Department of Physics, National Technical University of Athens, 15780 Athens, Greece
b Laboratoire CRISMAT, CNRS UMR 6508 Bd Marechal Juin, 14050 Caen Cedex, France
Full Text PDF
We report novel Raman measurements made on Pr 0.5 Ca 0.5 MnO 3 thin films grown on SrTiO 3 and LaAlO 3 (PCMO/STO and PCMO/LAO, respectively). The measurements were performed for a temperature range 78K <T<295K. Different scattering polarizations (xx, xz, x'x', and x'z') have been selected for certain temperatures in order to make the assignment of the modes, appearing in the Raman spectra. X-ray diffraction measurements have shown that the PCMO/STO film is [010]-oriented and the PCMO/LAO film is [101]-oriented due to the lattice mismatch. Close to the transition temperature to the charge ordered state, T CO , an increase in relative intensities of the high energy modes has been observed with decreasing temperature.
DOI: 10.12693/APhysPolA.105.99
PACS numbers: 75.47.Gk, 78.30.--j, 63.20.--e