Superconductivity in narrow-band systems with local nonretarded attractive interactions

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Reviews of Modern Physics; (USA)

DOI:https://doi.org/10.1103/RevModPhys.62.113· OSTI ID:6964195

Micnas, R ^[1]; Ranninger, J ^[2]; Robaszkiewicz, S ^[3]

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1. Institute of Physics, A. Mickiewicz University, 60-769 Poznan, (Poland)
2. Centre National de la Recherche Scientifique, Centre de Recherches sur les Tres Basses Temperatures, Bote Postale 166X, 38042 Grenoble-CEDEX, (France)
3. Institute of Physics, A. Mickiewicz University, 60-780 Poznan, (Poland)

In narrow-band systems electrons can interact with each other via a short-range nonretarded attractive potential. The origin of such an effective local attraction can be polaronic or it can be due to a coupling between electrons and excitons or plasmons. It can also result from purely chemical (electronic) mechanisms, especially in compounds with elements favoring disproportionation of valent states. These mechanisms are discussed and an exhaustive list of materials in which such local electron pairing occurs is given. The authors review the thermodynamic and electromagnetic properties of such systems in several limiting scenarios: (i) Systems with on-site pairing which can be described by the extended negative-{ital U} Hubbard model. The strong-attraction limit of this model, at which it reduces to a system of tightly bound electron pairs (bipolarons) on a lattice, is extensively discussed. These electron pairs behaving as hard-core charged bosons can exhibit a superconducting state analogous to that of superfluid {sup 4}He II. The changeover from weak-attraction BCS-like superconductivity to the superfluidity of charged hard-core bosons is examined. (ii) Systems with intersite pairing described by an extended Hubbard model with {ital U}{gt}0 and nearest-neighbor attraction and/or nearest-neighbor spin exchange as well as correlated hopping. (iii) A mixture of local pairs and itinerant electrons interacting via a charge-exchange mechanism giving rise to a mutually induced superconductivity in both subsystems. The authors discuss to what extent the picture of local pairing, and in particular superfluidity of hard-core charged bosons on a lattice, can be an explanation for the superconducting and normal-state properties of the high-{ital T}{sub {ital c}} oxides: doped BaBiO{sub 3} and the cuprates.

• OSTI ID: 6964195
• Journal Information: Reviews of Modern Physics; (USA), Vol. 62:1; ISSN 0034-6861
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
PEROVSKITES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
PAIRING INTERACTIONS
BCS THEORY
CRITICAL FIELD
ELECTRON-ELECTRON COUPLING
EXCHANGE INTERACTIONS
EXCITONS
PLASMONS
POLARONS
REVIEWS
THERMODYNAMIC PROPERTIES
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INTERACTIONS
MAGNETIC FIELDS
PHYSICAL PROPERTIES
QUASI PARTICLES
656100* - Condensed Matter Physics- Superconductivity