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This article is cited in 5 scientific papers (total in 5 papers)
XXIV International Symposium Nanophysics and Nanoelectronics, Nizhny Novgorod, March 10-13, 2020
Superconductivity
Nature of the pseudogap phase of HTSC cuprates
A. S. Moskvin, Yu. D. Panov Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
Abstract:
The pseudogap phase of HTSC cuprates is associated with the formation of a system of quantum electron-hole (EH) dimers similar to the Anderson RVB-phase. We considered the specific role of electron-lattice relaxation in the formation of metastable EH dimers in cuprates with $T$- and $T'$-structures. In the model of charge triplets and $S$ = 1 pseudospin formalism, the effective spin-pseudospin Hamiltonian of the cuprate CuO$_2$ plane is introduced. In the framework of the molecular field approximation (MFA) for the coordinate representation, the main MFA phases were found: an antiferromagnetic insulator, a charge density wave, a bosonic superconductor with $d$-symmetry of the order parameter, and two metal Fermi-phases forming the phase of the “strange” metal. We argue that the MFA can correctly reproduce all the features of the typical cuprate phase diagrams. As for typical $s$ = 1/2 quantum antiferromagnet the actually observed cuprate phases such as charge order and superconductivity reflect “physical” ground state, which is close to MFA-phases but with strongly reduced magnitudes of the local order parameters.
Keywords:
cuprates, electron-hole dimers, pseudogap behavior, molecular field.
Received: 26.03.2020 Revised: 26.03.2020 Accepted: 02.04.2020
Citation:
A. S. Moskvin, Yu. D. Panov, “Nature of the pseudogap phase of HTSC cuprates”, Fizika Tverdogo Tela, 62:9 (2020), 1390–1397; Phys. Solid State, 62:9 (2020), 1554–1561
Linking options:
https://www.mathnet.ru/eng/ftt8307 https://www.mathnet.ru/eng/ftt/v62/i9/p1390
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