Zobrazeno 1 - 10
of 124
pro vyhledávání: '"Barabanov, A. F."'
Autor:
Savchenkov, P. S., Barabanov, A. F.
We predict that spin-waves in an ordered square quantum antiferromagnet in a transverse magnetic field (h) may demonstrate three modes of spin excitations. Starting from the self-consistent rotation-invariant Green's function method, a new mean-field
Externí odkaz:
http://arxiv.org/abs/2003.12387
We address quantum spin helical states in the strongly frustrated Heisenberg model. Contrary to conventional Dzyaloshinskii-Moriya approach we show that such states appear without central symmetry breaking. As an example, we demonstrate that the magn
Externí odkaz:
http://arxiv.org/abs/1912.06399
The specific heat and susceptibilities for the two- and one-dimensional spin--orbital models are calculated in the framework of a spherically symmetric self-consistent approach at different temperatures and relations between the parameters of the sys
Externí odkaz:
http://arxiv.org/abs/1905.05791
Publikováno v:
Journal of Physics: Condensed Matter, Volume 31, Number 45 (2019)
Frustrated magnetic compounds, in particular low-dimensional, are topical research due to persistent uncover of novel nontrivial quantum states and potential applications. The problem of this field is that many important results are scattered over th
Externí odkaz:
http://arxiv.org/abs/1807.08245
The effect of the Coulomb repulsion of holes on the Cooper instability in an ensemble of spin-polaron quasiparticles has been analyzed, taking into account the peculiarities of the crystallographic structure of the CuO$_2$ plane, which are associated
Externí odkaz:
http://arxiv.org/abs/1711.05059
Within the spin-fermion model for cuprate superconductors, the influence of the intersite Coulomb interactions $V_2$ and $V_2'$ between holes located at the next-nearest-neighbor oxygen ions of CuO$_2$ plane on the implementation of the d_{x^2-y^2}-w
Externí odkaz:
http://arxiv.org/abs/1611.00158
It is shown that the spin-fermion model found to be an effective low-energy implementation of the three-band Emery model after Wannier transformation of $p_x$- and $p_y$-orbitals in the oxygen ions subsystem is reduced to the generalized Kondo lattic
Externí odkaz:
http://arxiv.org/abs/1606.04727
Publikováno v:
JETP Lett. 103, 385 (2016)
It is shown that an account for the space separatedness of the two-orbital subsystem of the oxygen holes and the subsystem of the localized spins of copper ions in high-T$_c$ cuprate superconductors leads to the stability of the superconducting $d_{x
Externí odkaz:
http://arxiv.org/abs/1601.06894
Publikováno v:
JMMM, v. 419, p. 131 (2016)
Using the spherically symmetric self-consistent Green's function method, we consider thermodynamic properties of the $S=1/2$ $J_1$-$J_2$ Heisenberg model on the 2D square lattice. We calculate the temperature dependence of the spin-spin correlation f
Externí odkaz:
http://arxiv.org/abs/1508.03197
Publikováno v:
JETP Lett., 100, 187 (2014)
Possible types of elementary excitations in the symmetric spin-orbital model on the a square lattice are analyzed using a spherically symmetric self-consistent approach. The excitation spectra are calculated. The behavior of the corresponding correla
Externí odkaz:
http://arxiv.org/abs/1409.0557