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7 papers · 1 filter
Effective indirect multi-site spin-spin interactions in the s-d(f) model
K. K. Komarov, D. M. Dzebisashvili
Using the diagram technique for Matsubara Green's functions it is shown that the dynamics of the localized spin subsystem in the s-d(f) model can be described in terms of an effect…
Magnetic mechanisms of pairing in strongly correlated electron system of copper oxides
S. G. Ovchinnikov, I. A. Makarov, E. I. Shneyder +3
The multielectron LDA+GTB approach has been developed to calculate electronic structure of strongly correlated cuprates. At low energies the effective Hamiltonian of the $t - t' -…
Uniaxial anisotropy and low-temperature antiferromagnetism of Mn2BO4 single crystal
N. V. Kazak, M. S. Platunov, Yu. V. Knyazev +8
The Mn2BO4 single crystals have been grown using the flux technique. The careful study crystal structure and magnetic properties have been carried out. The antiferromagnet transiti…
Cuprates, Manganites, and Cobaltites: Multielectron Approach to the Band Structure
M. M. Korshunov, S. G. Ovchinnikov, E. I. Shneyder +4
High- superconductors with CuO layers, manganites LaSrMnO, and cobaltites LaCoO present several mysteries in their physical properties. Most of them ar…
Charge-transfer and Mott-Hubbard Excitations in FeBO3: Fe K edge Resonant Inelastic X-ray Scattering Study
Jungho Kim, Yuri Shvyd'ko
Momentum-resolved resonant inelastic x-ray scattering (RIXS) spectroscopy has been carried out at the Fe K edge, successfully for the first time. The RIXS spectra of a FeBO3 single…
Lifshitz quantum phase transitions and Fermi surface transformation with hole doping in high- superconductors
S. G. Ovchinnikov, M. M. Korshunov, E. I. Shneyder
We study the doping evolution of the electronic structure in the normal phase of high- cuprates. Electronic structure and Fermi surface of cuprates with single CuO layer i…