37 research outputs found
Optical investigations of La0.7Ca0.3-xKxMnO3 (x = 0.00, 0.05 and 0.10) probed by spectroscopic ellipsometry
Using spectroscopic ellipsometry, we have studied the optical properties of doped manganites at the paramagnetic state in polycrystalline La0.7Ca0.3-xKxMnO3 samples for (x = 0.00, 0.05 and 0.10) in the energy range of 3.2-5.5 eV at room temperature. The surface morphology of the samples was obtained by using atomic force microscopy (AFM). Refractive indices, extinction coefficients, the transmission ellipsometric parameters Ψ and Δ are investigated at different wavelengths. The study of the optical conductivity σ reveals that optical behaviour and the activated transport in the paramagnetic state of these materials are consistent with Jahn-Teller small polaron. In addition, the spectrum of the complex dielectric constant ε reveals peaks for all samples, the results may be explained by the presence of space charges from the strongly dipole-allowed O(2p)−Mn(3d) transition
Physical investigations on LaMn1−xNixO3 perovskite sprayed thin films along with surface magnetic applications
International audienc
Investigation of Some Physical Properties of Cobalt Doped MoO3 Nanofilms and Their Effects on the Degradation of the Methylene Blue Solution under UV Illumination
International audienc