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X-ray powder diffractometer Bruker D8 (CuKα radiation, SOL-X energy dispersive detector) is used to determine: Phase compositions Lattice parameters Crystal structure Crystallite (grain) size Preferred orientation (texture)
We develop and apply the novel computational scheme LDA+DMFT to study materials with correlated electrons from first principles. LDA+DMFT is based on a combination of conventional band-structure methods, e.g., the local density approximation (LDA), with the dynamical mean-field theory (DMFT) for correlated electron systems. This allows us to...
The study is aimed to the development of new hybride nanoparticles for the use for magnetic resonance imaging as contrast materials, local destruction of cancers by the magnetic fluid hyperthermia and DNA diagnostics of microorganisms. It includes the synthesis of magnetic cores, their stabilization in a form of suspensions, ensuing preparation...
The cobaltites derived from LaCoO3 are prospective materials for their electronic and catalytic properties and represent also fundamental interest because of the temperature and pressure driven transitions between Co(III) ionic states of different spin numbers. The aim of the project is to investigate novel phenomenon where itinerant charge...
The project deals with a fundamental research on novel oxide thermoelectric materials of p-type considered for the electric power generation using waste heat. As concerns the conversion efficiency of such thermoelectric generators, the materials should operate in wide temperature range and keep at the same time a high figure of merit, ZT =(S2R)T,...
The semiconductors based on ZnO doped by magnetic impurities belong to a new class of advanced materials, dilute magnetic semiconductors, which have recently received much experimental and theoretical attention as a suitable spin source for spintronic applications. Some of the highly doped wide band gap materials like (Zn,Mn)O reveal a...
Fast progress in miniaturization of electronic devices requires new approach not only in the technology, producing nanometric and subnanometric objects, but also in their characterization. EMCD – electron magnetic circular dichroism represents a new method, which uses the electron transmission microscope to determine the magnetic moments of atoms...
In many magnetic materials it is possible to change the size of the magnetic moments, typically reduce, by application of pressure. Such transition is usually abrupt and sometimes is accompanied transtion to a metallic state. Using the LDA+DMFT computational scheme we were able to obtain such a behavior in MnO and Fe2O3 in agreement with...
Synthesized stable water suspensions of manganese perovskites magnetic nanoparticles of the composition La1-xSrxMnO3 of advantageous properties markedly exceeding the behaviour of the existing commercial products on the basis of iron oxides. They afford higher heating efficiency and simultaneously controlled heating excluding the local...
The result of our research is an unified description of the magnetic and electric transitions in cobaltites LnCoO3 (Ln = La, Y, rare earths), associated with thermally activated changes of the spin state of the octahedrally coordinated Co3+ ions, and the determination of the polaron character of the hole and electron carriers in doped cobaltites.
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