Zobrazeno 1 - 10
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pro vyhledávání: '"Ovchinnikov, S"'
Physics of high-$T_c$ superconducting cuprates is obscured by the effect of strong electronic correlations. One way to overcome the problem is to seek for an exact solution at least within the small cluster and expand it to the whole crystal. Such an
Externí odkaz:
http://arxiv.org/abs/2305.01882
Autor:
Zhandun, V. S., Kazak, N. V., Kupenko, I., Vasiukov, D. M., Li, X., Blackburn, E., Ovchinnikov, S. G.
The magnetic and electronic structures of Fe4O5 have been investigated at ambient and high pressures via a combination of representation analysis, density functional theory (DFT+U) calculations, and M\"ossbauer spectroscopy. A few spin configurations
Externí odkaz:
http://arxiv.org/abs/2301.02824
Ultrafast quantum dynamics relaxation of a photoexcited state in a strongly correlated spin crossover system LaCoO3 under a sudden perturbation is considered with the density matrix generalized master equation. The magnetization and cobalt-oxygen bon
Externí odkaz:
http://arxiv.org/abs/2211.01300
The effects associated with interatomic hoppings of excitons and the excitonic Bose condensate formation in the strongly correlated spin crossover systems are considered in the framework of the effective Hamiltonian for the two-band Kanamori model. T
Externí odkaz:
http://arxiv.org/abs/2206.13821
Publikováno v:
Materials 15, 4583 (2022)
Electronic structure and magnetic properties of Fe$_3$Se$_4$ are calculated using the density functional approach. Due to the metallic properties, magnetic moments of the iron atoms in two nonequivalent positions in the unit cell are different from i
Externí odkaz:
http://arxiv.org/abs/2205.14346
Autor:
Makarov, I. A., Ovchinnikov, S. G.
In this work, the concentration and temperature dependences of the superconducting gap of the HTSC cuprate in the orthorhombic phase are obtained within the framework of the Hubbard model taking into account the exchange mechanism of pairing. The enh
Externí odkaz:
http://arxiv.org/abs/2110.08550
Publikováno v:
Phys. Rev. B 104 155153 2021
We consider how electron-phonon interaction influences the insulator-metal transitions driven by doping in the strongly correlated system. Using the polaronic version of the generalized tight-binding method, we investigate a multiband two-dimensional
Externí odkaz:
http://arxiv.org/abs/2105.12438
Autor:
Kazak, N. V., Platunov, M. S., Knyazev, Yu. V., Molokeev, M. S., Gorev, M. V., Ovchinnikov, S. G., Pchelkina, Z. V., Gapontsev, V. V., Streltsov, S. V., Bartolomé, J., Arauzo, A., Yumashev, V. V., Gavrilkin, S. Yu., Wilhelm, F., Rogalev, A.
Publikováno v:
Phys. Rev. B 103, 094445 (2021)
The magnetic contribution of the Co3+ ions in Co3BO5 has been investigated using the Co (K-edge) XMCD, dc magnetic susceptibility, and heat capacity measurements. The crystal structure of Co3BO5 single crystal has been solved in detail at the T range
Externí odkaz:
http://arxiv.org/abs/2009.05725
Within the multielectron model of magnetic insulator with spin crossover under high pressure we have studied the mean field phase diagrams in pressure temperature plane and dynamics of a sudden excited non equilibrium spin state. We obtain the differ
Externí odkaz:
http://arxiv.org/abs/2006.00539