Magnetic hysteresis in a molecular Ising ferrimagnet: Glauber dynamics approach (2009)
Bukharov, A. A., Ovchinnikov, A. S., Baranov, N. V., Inoue, K.
Motivated by recent experimental results reporting giant coercive fields in Co(II)-based molecular magnets we present a theory of hysteresis phenomena based on the Glauber stochastic dynamics....
Spin resonance in chiral helimagnet (2009)
Kishine, Jun-ichiro, Ovchinnikov, A. S.
It is suggested that marked features of symmetry breaking mechanism and elementary excitations in chiral helimagnet come up as visible effects in electron spin resonance (ESR) profile. Under the...
Bostrem, I. G., Kishine, J., Lavrov, R. V., Ovchinnikov, A. S.
Motivated by the spin current problem in chiral helimagnet, we rigorously elucidated the hidden Galilean invariance in the chiral XY model under the magnetic field. The Lie group analysis is applied...
Theory of spin current in chiral helimagnet (2008)
Bostrem, I. G., Kishine, Jun-ichiro, Ovchinnikov, A. S.
We give detailed description of the transport spin current in the chiral helimagnet. Under the static magnetic field applied perpendicular to the helical axis, the magnetic kink crystal (chiral...
Transport magnetic currents driven by moving kink crystal in chiral helimagnets (2008)
Bostrem, I. G., Kishine, Jun-ichiro, Ovchinnikov, A. S.
We show that the bulk transport magnetic current is generated by the moving magnetic kink crystal (chiral soliton lattice) formed in the chiral helimagnet under the static magnetic field applied...
Sinitsyn, V. E., Bostrem, I. G., Ovchinnikov, A. S.
We present a quantum cluster solver for spin-$S$ Heisenberg model on a two-dimensional lattice. The formalism is based on the real-space renormalization procedure and uses the lattice point...
Ovchinnikov, A. S., Bostrem, I. G., Sinitsyn, V. E., Boyarchenkov, A. S., Baranov, N. V., Inoue, K.
Based on a quantum dissipation theory of open systems, we present a theoretical study of slow dynamics of magnetization for the ordered state of the new molecule-based magnetic complex...
Spiral vortices in a 2D ferromagnet (2005)
Borisov, A. B., Bostrem, I. G., Ovchinnikov, A. S.
We present a study of a new class of exact solutions having a form of spiral vortices for an isotropic two-dimensional Heisenberg ferromagnet using a continuum theory and direct numerical simulations...
Boyarchenkov, A. S., Ovchinnikov, A. S., Bostrem, I. G., Baranov, N. V., Hosokoshi, Y., Inoue, K.
The real-space RG approach is applied to study critical temperatures of system consisting of interacting spin chains of spin S=1 with an inner antiferromagnetic exchange which form a honeycomb...
Sinitsyn, E. V., Bostrem, I. G., Ovchinnikov, A. S.
For two-dimensional Heisenberg antiferromagnet we present an analysis of topological coreless excitations having a stripe form. These textures are characterized by singularities at boundaries. A...
Topological phase separation in 2D hard-core Bose-Hubbard system away from half-filling (2004)
Moskvin, A. S., Bostrem, I. G., Ovchinnikov, A. S.
We suppose that the doping of the 2D hard-core boson system away from half-filling may result in the formation of multi-center topological defect such as charge order (CO) bubble domain(s) with Bose...
Egorov, R. F., Bostrem, I. G., Ovchinnikov, A. S.
The nonlinear partial differential equations describing the spin dynamics of Heisenberg ferro and antiferromagnet are studied by Lie transformation group method. The generators of the admitted...
A long-wave action of spin Hamiltonians and the inverse problem of the calculus of variations (2003)
Bostrem, I. G., Ovchinnikov, A. S., Egorov, R. F.
We suggest a method of derivation of the long-wave action of the model spin Hamiltonians using the non-linear partial differential equations of motions of the individual spins. According to the...
A new class of nodal stationary states in 2D Heisenberg ferromagnet (2003)
Bostrem, I. G., Ovchinnikov, A. S.
A new class of nodal topological excitations in a two-dimensional Heisenberg model is studied. The solutions correspond to a nodal singular point of the gradient field of the azimuthal angle. An...
The singlet-triplet magnetism and induced spin fluctuations in the high-$T_c$ copper oxides (1997)
Moskvin, A. S., Ovchinnikov, A. S.
High-$T_c$ cuprates like $La_{2-x}Sr_{x}CuO_{4}$ and $YBa_{2-x}Cu_{3}O_{6+x}$ are considered as a system of the electron and hole polar pseudo-Jahn-Teller $CuO_{4}$ centers $[{CuO}_{4}^{7-}]_{JT}$...
Polar Jahn-Teller centers and magnetic neutron scattering cross-section in copper oxides (1997)
Moskvin, A. S., Ovchinnikov, A. S.
In the framework of the model of the polar singlet-triplet Jahn-Teller centers the cross-section is obtained for magnetic neutron scattering in high-$T_{c}$ cuprates. Multi-mode character of the...
Moskvin, A. S., Ovchinnikov, A. S., Kovalev, O. S.
Spin subsystem of the copper oxides within the polar Jahn-Teller centers model corresponds to a singlet-triplet magnet where the local boson movement accompanied by the induced longitudinal spin...
Polar Jahn-Teller Centers and Isotope Effect in Copper Oxide high-T_c-Superconductors (1997)
Moskvin, A. S., Ovchinnikov, A. S., Panov, Yu. D., Sidorov, M. A.
The $CuO_4$-cluster based copper oxides are considered as generalized quantum lattice bose-gas or a system of the local singlet bosons moving in a lattice of the hole Jahn-Teller centers...