Nature of the Pseudogap Phase of HTSC Cuprates
| Autor: | Yu. D. Panov, A. S. Moskvin |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Condensed matter physics Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Charge ordering symbols.namesake Condensed Matter::Superconductivity 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons Cuprate 010306 general physics Pseudogap Ground state Hamiltonian (quantum mechanics) Charge density wave Phase diagram |
| Zdroj: | Physics of the Solid State. 62:1554-1561 |
| ISSN: | 1090-6460 1063-7834 |
| Popis: | 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. A specific role of the electron–lattice relaxation in the formation of metastable EH dimers in cuprates with the T and T ' structures is considered. An effective spin–pseudospin Hamiltonian of the CuO2 plane of cuprate is introduced in the model of charge triplets and S = 1 the pseudospin formalism. In the molecular-field approximation (MFA), for the coordinate representation, the main MFA phases have been found: antiferromagnetic insulator, charge density wave, boson superconductor with the d-symmetry of the order parameter, and two metallic Fermi-phases that form the “strange”-metal phase. MFA is shown to enable, as a whole, a proper description of the features of the phase diagrams typical of cuprates. As in the case of typical s = 1/2 quantum antiferromagnet, the actually observed cuprate phases such as the charge ordering and the superconductivity reflect a “physical” ground state close to MFA phases but with strongly reduced values of local order parameters. |
| Databáze: | OpenAIRE |
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