A5071565260- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- Magnetic properties of thin films
- Theoretical and Computational Physics
- Superconductivity in MgB2 and Alloys
- Electronic and Structural Properties of Oxides
- Inorganic Fluorides and Related Compounds
- Material Science and Thermodynamics
- High-pressure geophysics and materials
- Crystallography and Radiation Phenomena
- Magnetism in coordination complexes
- Atomic and Subatomic Physics Research
- Multiferroics and related materials
- Solid-state spectroscopy and crystallography
- Quantum and electron transport phenomena
- Crystal Structures and Properties
- Advanced Physical and Chemical Molecular Interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Heusler alloys: electronic and magnetic properties
- Thermal Expansion and Ionic Conductivity
- Chemical and Physical Properties of Materials
- Magnetic Properties and Synthesis of Ferrites
- Metallurgical Processes and Thermodynamics
Siberian Branch of the Russian Academy of Sciences
1997-2024
Rome International Center for Materials Science
2024
Institute of Physics
2006-2023
Russian Academy of Sciences
1997-2023
Krasnoyarsk Scientific Center
2001-2022
Institute of Chemistry and Chemical Technology
2016
Siberian Federal University
2015
The microscopic origin of ultrafast modification the ratio between symmetric ($J$) and antisymmetric ($D$) exchange interaction in antiferromagnetic iron oxides is revealed, using femtosecond laser excitation as a pump terahertz emission spectroscopy probe. By tuning photon energy pulse we show that effect light on $D/J$ two archetypical ${\mathrm{FeBO}}_{3}$ ${\mathrm{ErFeO}}_{3}$ maximized when resonance with spin parity forbidden $d\ensuremath{-}d$ transition crystal-field split states...
A hybrid scheme for the electronic structure calculations of strongly correlated electron systems is proposed. The ab initio local density approximation calculation used to construct Wannier functions and obtain single Coulomb parameters multiband Hubbard-type model. In strong correlation regime within Hubbard model calculated by generalized tight-binding method, which combines exact diagonalization Hamiltonian a small cluster (unit cell) with perturbation treatment intercluster hopping...
Many microscopic models with interaction between the next-nearest neighbours as a key parameter to cuprate physics inspired us study here diagonal superexchange in CuO$_2$ layer. Our investigation shows extended hopping give correct representation of magnetic interactions only hypothetical square layer, where neighbors always has AFM nature. The conclusions are based on presence symmetry prohibition FM contribution total for simple but not real We actually confirm also there justified...
We propose a multielectron approach to calculate superexchange interaction in magnetic Mott- Hubbard insulator La2CuO4(further La214) that allows obtain the effect of optical pumping on interaction. use cell perturbation theory with exact diagonalization multiband pd Hamiltonian inside each CuO6 unit and treating intercell hopping as perturbation. To incorporate we include this work excited singlehole local states well all two-hole singlets triplets. By projecting out interband electron have...
Local and fast structural probes using synchrotron radiation have shown nanoscale striped puddles phase separation in doped perovskites. It is known that the phases perovskites are due to competing interactions involving charge, spin, lattice degrees of freedom. In this work, we show two different stripes can be represented as a superposition pair stripes, U(θ n) or D(θ n), characterized by perovskite tilts where one rotated relation other partner an angle Δθ n = π/2. The spatial...
We derived simple rules for the sign of ${180}^{\ensuremath{\circ}}$ superexchange interaction based on multielectron calculations in transition metal oxides that are valid both below and above spin crossover under high pressure. The between two cations ${d}^{n}$ configurations is given by a sum partial contributions related to electron-hole virtual excitations different states ${d}^{n+1}$ ${d}^{n\ensuremath{-}1}$ configurations. Using these rules, we have analyzed number with magnetic...
Abstract The pressure effects on the normal state electronic structure, superexchange interaction, and critical temperature of d ‐type superconductivity mediated by magnetic pairing have been studied within multielectron hybrid scheme LDA+GTB that takes into account electron correlations in planes. We found changes multiband p – model parameters at 3% compression different symmetry: (i) hydrostatic, (ii) along c ‐axis, (iii) a b plane. Fermi surface under external for hole doping...
We have studied the superexchange interaction Jij in doped 2D cuprates. The AFM strongly depends on state of lattice a CuO2 layer surrounded by two LaO rock salt layers. In static U and D stripe nanostructure, homogeneous is impossible due to U/D/U… periodic sequence TN=0. dynamic ideal with nonlocal effects are restored. However, decreases exponential factor partial quenching. meaning transition from cases lies spontaneous θ-symmetry breaking respect rotation all tilted CuO6 octahedra an...
In the work we studied a quasiparticle dispersion and spectral intensity in doped manganites p-type La1-xMxMnO3 (M=Sr,Ca,Ba). To calculate strongly correlated electronic (SEC) structure used LDA+GTB approach taking account antiferro-orbital ordering real spin S=2. ferromagnetic phase (FM) reproduce half-metal state corresponding to 100% spin-polarization at T=0K . paramagnetic (PM) detected modification character of quasiparticles approximately three-fold (~0.35) reduction valence band dispersion.
A scientific session of the Division General Physics and Astronomy Russian Academy Sciences was held on April 23, 1997 at P L Kapitza Institute for Physical Problems. The following reports were presented session: (1) Simonov V I (Institute Crystallography, RAS, Moscow) 'Structural investigation single crystals structure—properties correlation'; (2) Fridman M Astronomy, 'Giant curls in galaxies'; (3) Balaev D, Val'kov V, Gavrichkov A, Ivanova N B, Ovchinnikov S G, Chernov K (Kirenskii...
Based on the Wilson's criterion metal/insulator, extended to materials with strong electronic correlations, we have identified a specific class of materials, which is not associated their usual classification into Mott-Hubbard and charge transfer dielectrics. The local symmetry these leads disappearance quasiparticle states (so-called first removal or extra states) in Hubbard gap. It especially unusual for doped quasiparticles, being carriers, can disappear appear under external factors...