122 citations · 360 across the 24 of their papers we have counts for
23 papers
Quantum magnetic phase transitions in a Kugel-Khomskii model including spin-orbit coupling
D. E. Chizhov, P. A. Igoshev, V. Yu. Irkhin
Using the formalism of pseudospin and isospin operators the Hamiltonian of an effective Kugel-Khomskii model with spin-orbit coupling is derived with an exact account of the $t_{2g…
Itinerant electron metamagnetism for lattices with van Hove density-of-states singularities near the Fermi level
F. A. Vasilevskiy, P. A. Igoshev, V. Yu. Irkhin
Itinerant-electron metamagnetism is investigated within the Hubbard model for various lattices having van Hove singularities (vHS) in the electronic spectrum: face-centered cubic a…
Spin-orbit coupling induced orbital entanglement in a three-band Hubbard model
Petr A. Igoshev, Danil E. Chizhov, Valentin Yu. Irkhin +1
The effect of the spin-orbit coupling on the ground state properties of the square-lattice three-band Hubbard model with a single electron per site is studied by a generalized Hart…
Inverse magnetocaloric effect and phase separation induced by giant van Hove singularity in itinerant ferromagnetic metal
Petr A. Igoshev, Igor A. Nekrasov
A thermodynamic theory based on Landau grand potential expansion for ferromagnetic-paramagnetic phase transitions is developed for an electronic phase-separated state. It is rigoro…
Ferromagnetic instability in itinerant fcc lattice electron systems with higher order van Hove singularities: Functional renormalization group study
P. A. Igoshev, A. A. Katanin
We investigate the possibility of ferromagnetic ordering in the non-degenerate Hubbard model on the face-centered cubic lattice within the functional renormalization group techniqu…
Giant density-of-states van Hove singularities in the face-centered cubic lattice
P. A. Igoshev, V. Yu. Irkhin
All van Hove singularities in the density of states (DOS) of face-centered cubic lattice in the nearest and next-nearest neighbour approximation, focusing on higher-order ones, are…