Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/118208
Title: Phase separation in high-Tccuprates
Authors: Moskvin, A. S.
Panov, Y. D.
Issue Date: 2022
Publisher: IOP Publishing Ltd
Citation: Moskvin A. S. Phase separation in high-Tccuprates / A. S. Moskvin, Y. D. Panov // Journal of Physics: Conference Series. — 2022. — Vol. 2164. — Iss. 1. — 12014.
Abstract: We develop a minimal non-BCS model for the CuO2 planes with the on-site Hilbert space reduced to only three effective valence centers CuO4 with different charge, conventional spin, and orbital symmetry, combined in a charge triplet, to describe the low-energy electron structure and the phase states of HTSC cuprates. Using the S = 1 pseudospin algebra we introduce an effective spin-pseudospin Hamiltonian which takes into account local and nonlocal correlations, one- and two-particle transport, and spin exchange. The T-n phase diagrams of the complete spin-pseudospin model for the CuO2 planes were reproduced by means of a site-dependent variational approach within effective field approximation typical for spin-magnetic systems. Limiting ourselves to two-sublattice approximation and nn-couplings we arrived at several Néel-like phases in CuO2 planes for parent and doped systems with a single nonzero local order parameter: antiferromagnetic insulator, charge order, glueless d-wave Bose superfluid phase, and unusual metallic phase. However, the Maxwell's construction shows the global minimum of free energy is realized for phase separated states which are bounded by the third-order phase transition line T∗(n), which is believed to be responsible for the onset of the pseudogap phenomenon. © Published under licence by IOP Publishing Ltd.
Keywords: COPPER OXIDES
ELECTRONS
PHASE DIAGRAMS
PHASE SEPARATION
CUPRATES
EFFECTIVE VALENCE
ELECTRON STRUCTURES
HIGH T C
LOW ENERGY ELECTRONS
ORBITAL SYMMETRIES
PHASE STATE
PSEUDO-SPIN HAMILTONIAN
PSEUDOSPIN
SPIN SYMMETRY
FREE ENERGY
URI: http://hdl.handle.net/10995/118208
Access: info:eu-repo/semantics/openAccess
Conference name: 2020 International Conference on Strongly Correlated Electron Systems, SCES 2020
Conference date: 27 September 2021 through 1 October 2021
SCOPUS ID: 85127286038
ISSN: 17426588
DOI: 10.1088/1742-6596/2164/1/012014
metadata.dc.description.sponsorship: Ministry of Education and Science of the Russian Federation, Minobrnauka: FEUZ-2020-0054
This research was partially supported by the Ministry of Education and Science of Russian Federation, project No FEUZ-2020-0054.
Pagliuso P.J.G.Adriano C.Miranda E.
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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