Diagnostics of 'Colossal' Magnetoresistance Manganate Films by Raman Spectroscopy
V B. Podobedov, D B. Romero, A Weber, Joseph P. Rice, R Schreekala, M Rajeswari, R Ramesh, T Venkatesan, H D. Drew
Polarized Raman scattering by phonons is used to characterize thin films prepared by laser ablation of a lanthanum manganese oxide target. It was found that in the temperature range from 6 K to 300 K phonon spectra of La0.7Ca0.3MnO3 films exhibit observable differences from those in bulk materials (microcrystalline ceramics and single crystals). A significant difference was found in the spectra of as-grown films compared to those annealed in oxygen at 800 degrees C. The observed Raman peaks and their linewidths exhibit an irregular temperature dependence near Tc. A correlation of Raman data with magnetization of the sample was also found.
Applied Physics Letters
LCMO film, phonon, Raman scattering
, Romero, D.
, Weber, A.
, Rice, J.
, Schreekala, R.
, Rajeswari, M.
, Ramesh, R.
, Venkatesan, T.
and Drew, H.
Diagnostics of 'Colossal' Magnetoresistance Manganate Films by Raman Spectroscopy, Applied Physics Letters
(Accessed November 30, 2023)