Influence of Local Correlations on the “Homogeneous Insulator–Superconductor” Transition in the Domain Boundaries of the Charge-Order Phase of a 2D System of a Mixed Valence

• Published in: Physics of the solid state Vol. 60; no. 11; pp. 2132 - 2134
• Main Authors: Konev, V. V., Ulitko, V. A., Yasinskaya, D. N., Panov, Yu. D., Moskvin, A. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-11-2018; Springer Nature B.V
• Subjects: Antiphase boundaries; Boundaries; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Copper; CORRELATIONS; CUPRATES; Lattices; Physics; Physics and Astronomy; SIMULATION; Solid State Physics; SPIN; Superconductivity; SUPERCONDUCTORS; TETRAGONAL LATTICES; TRIPLETS; TWO-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL SYSTEMS; VALENCE; CO Phase; Charge Ordering (CO); Antiphase Domain Boundaries; Filamentary Superconductors; Model Cuprate
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783418110136

—It is demonstrated in the (pseudo)spin
S
= 1 formalism that the structure of antiphase domain boundaries in the phase of charge ordering of a mixed-valence system of the Cu
1+, 2+, 3+
“triplet” type in cuprates on a two-dimensional square lattice depends to a considerable extent on on-site correlation parameter
U
. The results of computer modeling on large square lattices illustrate the change in the boundary structure (from a homogeneous monovalent nonconducting structure of the Cu
2+
type to a filamentary superconducting one) induced by a relatively small variation of positive
U
values.