Electron–Hole Dimers in the Parent Phase of Quasi–2D Cuprates

The key feature of parent cuprates of the La 2 CuO 4 type, in addition to their high ionic polarizability and closeness to polarization catastrophe, is identified as their instability against charge transfer that is accompanied by the formation of a system of metastable dipole-active Mott–Hubbard ex...

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Bibliographic Details
Published in:Physics of the solid state 2019-09, Vol.61 (9), p.1553-1558
Main Authors: Moskvin, A. S., Panov, Yu. D.
Format: Article
Language:English
Subjects:
BOSONS
Charge transfer
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CUPRATES
DIMERS
DIPOLES
DOPED MATERIALS
Electron states
ELECTRON-HOLE COUPLING
EXCITONS
FERMI GAS
Fermi liquids
LANTHANUM COMPOUNDS
Phase equilibria
Physics
Physics and Astronomy
POLARIZABILITY
POLARIZATION
RECOMBINATION
Solid State Physics
Stability
Substitutes
Superconductivity
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Summary:The key feature of parent cuprates of the La 2 CuO 4 type, in addition to their high ionic polarizability and closeness to polarization catastrophe, is identified as their instability against charge transfer that is accompanied by the formation of a system of metastable dipole-active Mott–Hubbard excitons, i.e., electron–hole (EH) dimers. This feature determines the behavior of cuprates upon nonisovalent substitution. Within the simplest model equivalent to a system of composite bosons, nonisovalent substitution shifts the phase equilibrium toward condensation of EH dimers and the formation of inhomogeneous EH liquid. To describe the electronic state of doped cuprates effectively, we propose to use the pseudospin S = 1 formalism. It enables us to treat cardinally new charged states such as Anderson’s RVB phases. Recombination of EH dimers at a critically low energy of local and nonlocal correlations drives the system into the state of a Fermi liquid.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783419090178