For LaMnO3 strong coupling of the spin, charge, and orbital degrees of freedom is characteristic. The strong coupling is usually attributed to the strong electron-vibrational coupling due to the Jahn-Teller(JT) effect. That is why lattice dynamics of the pure LaMnO3 depends on the orbital structure. We have calculated both the fundamental phonon frequencies of the undoped LaMnO3 and the phonon ...

In situ X-ray absorption and emission spectroscopies (XAS XES) are used to provide details regarding the role of accessibility extent redox activity Mn ions in determining oxygen reduction LaMnO3 CaMnO3, with near-edge structure (XANES) providing average oxidation state, extended fine (EXAFS) local coordination environment, XES population ratios Mn2+, Mn3+, Mn4+ sites as a function applied pote...

Strong electronic correlations lead to rich phase diagrams of electronic and magnetic states for many transition-metal oxides. LaMnO3 is one of the prototype materials to study the resulting phenomena such as for example colossal magnetoresistance. The widely used local density approximation (LDA) to density functional theory (DFT) fails to correctly describe correlated-electron systems. Theref...

Two binary oxides, a spinel, ZnAl2O4, and a typical perovskite, LaMnO3, have been prepared via CTAB-1-butanol-n-octane-nitrate salt microemulsion in the reverse and bicontinuous states. The exact point of the reverse and bicontinuous states of the microemulsion used in the synthesis was determined by conductivity experiments. The materials obtained after heating at 800 degrees C were characteri...

THE STRUCTURAL, IMPEDANCE AND DIELECTRIC A FERRITE CORE OF IRON MANGANITE ITS COMPOSITE. Samples with single-phase MnFeO3 and multiphase MnFeO3/ZnFe2O4 (30/70), MnFeO3/ZnFe2O4/LaMnO3 (30/40/30) have been successfully prepared as ferrite cores by the solid-state reaction method using high energy milling. Crystal structure, surface morphology, impedance, AC-conductivity dielectric quantities, suc...

The effects of uniaxial strain on the structural, orbital, optical, and magnetic properties of LaMnO3 are calculated using realistic expressions for elastic energies, along with a tight-binding parametrization of the band theory and electron-phonon coupling. Tensile uniaxial strain of the order of 2% ~i.e., of the order of magnitude of those induced in thin films by lattice mismatch with substr...

A tight binding parameterization of the band structure, along with a mean field treatment of Hund, electron-electron, and electron-lattice couplings, is used to obtain the full optical conductivity tensor of LaMnO3 as a function of temperature. We predict striking change with temperature in the functional form and magnitude of the optical absorption. Comparison of our results to data will deter...