139 citations · 1k across the 65 of their papers we have counts for
38 papers · 1 filter
DFT, L(S)DA, LDA+U, LDA+DMFT..., whether we do approach to a proper description of optical response for strongly correlated systems?
A. S. Moskvin
I present a critical overview of so-called "{\it ab initio}" DFT (density fuctional theory) based calculation schemes for the description of the electronic structure, energy spectr…
Topological structures in unconventional scenario for 2D cuprates
A. S. Moskvin, Yu. D. Panov
We introduce a minimal model to describe the charge degree of freedom in cuprates with the on-site Hilbert space reduced to only the three valence states CuO (nomina…
Features of the Domain Boundaries of a Highly Anisotropic (S = 1) Antiferromagnet near the Transition to the Quantum Paramagnet Phase
V. V. Konev, V. A. Ulitko, D. N. Yasinskaya +2
It is shown that the structure of antiphase domain boundaries in the antiferromagnetic (AFM) phase of a highly anisotropic magnet with S = 1 on a two-dimensional square lattice dep…
Monte Carlo simulation of a model cuprate
Yu. D. Panov, A. S. Moskvin, A. A. Chikov +1
We develop a classical Monte Carlo algorithm based on a quasi-classical approximation for a pseudospin S=1 Hamiltonian in real space to construct a phase diagram of a model cuprate…
Dzyaloshinskii interaction and exchange-relativistic effects in orthoferrites
A. S. Moskvin
We present an overview of the microscopic theory of the Dzyaloshinskii-Moriya (DM) coupling and related exchange-relativistic effects such as exchange anisotropy, electron-nuclear…
NMR study of magnetic structure and hyperfine interactions in binary helimagnet FeP
A. A. Gippius, A. V. Tkachev, S. V. Zhurenko +7
We report a detailed study of the ground state helical magnetic structure in monophosphide FeP by means of P NMR spectroscopy. We show that the zero-field NMR spectrum of…
Dzyaloshinskii-Moriya coupling in 3d insulators
A. S. Moskvin
We present an overview of the microscopic theory of the Dzyaloshinskii-Moriya (DM) coupling in strongly correlated 3d compounds. Most attention in the paper centers around the deri…
57Fe Mössbauer study of unusual magnetic structure of multiferroic 3R-AgFeO2
Alexey V. Sobolev, Vyacheslav S. Rusakov, Alexander S. Moskvin +5
We report new results of a 57Fe Mössbauer study of multiferroic 3R-AgFeO2 powder samples performed in a wide temperature range, including two points, TN1 ~ 14 K and TN2 ~ 9 K, of m…
The Löwdin orthogonalization and magnetoelectric coupling for noncentrosymmetric ions
A. S. Moskvin
The Loewdin orthogonalization procedure being the well-known technique, particularly in quantum chemistry, however, gives rise to novel effects missed in earlier studies. Making us…
Pseudogap phase in cuprates: oxygen orbital moments instead of circulating currents
A. S. Moskvin
Circulating current (CC) loops within the cuprate unit cell are proposed to play a key role in the physics of the pseudogap phase. However, main experimental observations motivated…
Unusual X-ray excited luminescence spectra of NiO suggestive of a self-trapping of the d-d charge transfer exciton
V. I. Sokolov, V. A. Pustovarov, V. N. Churmanov +5
Luminescence spectra of NiO have been investigated under vacuum ultraviolet (VUV) and soft X-ray (XUV) excitation. Photoluminescence (PL) spectra show broad emission bands centered…
What is the true charge transfer gap in parent insulating cuprates?
A. S. Moskvin
A large body of experimental data point towards a charge transfer instability of parent insulating cuprates to be their unique property. We argue that the true charge transfer gap…
Interplay of p-d and d-d charge transfer transitions in rare-earth perovskite manganites
A. S. Moskvin, A. A. Makhnev, L. V. Nomerovannaya +2
We have performed both theoretical and experimental study of optical response of parent perovskite manganites RMnO_3 with a main goal to elucidate nature of clearly visible optical…
Disproportionation and electronic phase separation in parent manganite LaMnO_3
A. S. Moskvin
Nominally pure undoped parent manganite LaMnO_3 exhibits a puzzling behavior inconsistent with a simple picture of an A-type antiferromagnetic insulator (A-AFI) with a cooperative…
Spin polarization of the magnetic spiral in NaCu_2O_2, as seen by NMR
A. A. Gippius, A. S. Moskvin, S. -L. Drechsler
The incommensurate (IC) spin ordering in quasi-1D edge-shared cuprate NaCu_2O_2 has been studied by ^{23}Na nuclear magnetic resonance spectroscopy in an external magnetic field ne…
Microscopic mechanisms of spin-dependent electric polarization in 3d oxides
A. S. Moskvin, S. -L. Drechsler
We present a short critical overview of different microscopic models for nonrelativistic and relativistic magnetoelectric coupling including the so-called "spin current scenario",…
Quantum electric dipole glass and frustrated magnetism near a critical point in Li2ZrCuO4
E. Vavilova, A. S. Moskvin, Y. Arango +7
We report a new peculiar effect of the interaction between a sublattice of frustrated quantum spin-1/2 chains and a sublattice of pseudospin-1/2 centers (quantum electric dipoles)…
Nonrelativistic Multiferroicity in the Nonstoichiometric Spin s=1/2 Spiral Chain Cuprate LiCu2O2
A. S. Moskvin, Yu. D. Panov, S. -L. Drechsler
We argue for a recently observed puzzling multiferroic behavior in s=1/2 1D chain cuprate LiCu2O2 with edge-shared arrangement of CuO4 plaquettes and incommensurate spiral spin ord…
Multiferroicity due to nonstoichiometry in the chain cuprate LiVCuO_4
A. S. Moskvin, S. -L. Drechsler
The recently observed multiferroic behavior in the s=1/2 chain cuprate LiVCuO_4 (LiCuVO_4) with edge-shared CuO_4 plaquettes and helical spin ordering does not agree with the exist…
Microscopic mechanisms of spin-dependent electric polarization in 3d oxides
A. S. Moskvin, S. -L. Drechsler
We address a systematic microscopic theory of spin-dependent electric polarization in 3d oxides starting with a generic three-site two-hole cluster. A perturbation scheme realistic…
Field induced antiferromagnetism and O Knight shift anomaly in LaCuO
A. S. Moskvin
We address the effect of the field induced antiferromagnetism in paramagnetic state of the cuprate weak ferromagnet LaCuO. The planar oxygen O Knight shift is shown…
Dzyaloshinsky-Moriya antisymmetric exchange coupling in cuprates: Oxygen effects
A. S. Moskvin
We revisit a problem of Dzyaloshinsky-Moriya antisymmetric exchange coupling for a single bond in cuprates specifying the local spin-orbital contributions to Dzyaloshinsky vector f…
Charge Transfer Excitations in Insulating Copper Oxides
A. S. Moskvin, S. -L. Drechsler, R. Hayn +1
A semi-quantitative cluster approach is developed to describe the charge transfer (CT) electron-hole excitations in insulating cuprates in a rather wide energy range up to 10- 15 e…
Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid
A. S. Moskvin
We develop a model approach to describe charge fluctuations and different charge phases in strongly correlated 3d oxides. As a generic model system one considers that of centers ea…