Phonon-mediated attraction between large bipolarons: Condensation to a liquid

Journal Article · Thu Mar 31 23:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.9157· OSTI ID:5118252

Emin, D ^[1]

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1. Sandia National Laboratories, Albuquerque, New Mexico 87185-0345 (United States)

The self-trapped carriers of large (multisite) bipolarons redistribute themselves among the sites of their molecular orbitals as their self-trapping potential wells are altered by changing atomic positions. Through this polarizability, large bipolarons reduce the phonon frequencies. The dependence of the lowering of the zero-point vibrational energy on the spatial distribution of large bipolarons produces an intermediate-ranged phonon-mediated attraction between large bipolarons that is comparable to a phonon energy. Coulomb repulsions that oppose the phonon-mediated attractions tend to be suppressed by the large static dielectric constants associated with large-bipolaron formation. However, a strong short-range repulsion between bipolarons, analogous to the hard-core repulsion between helium atoms, persists. With the dominance of the medium-range phonon-mediated attraction and the short-range repulsion, large bipolarons can condense into a liquid. The bipolaronic liquid might be the condensed fluid phase that has been suggested as a precursor to superconductivity in cuprates.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5118252
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:13; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSE-EINSTEIN CONDENSATION
COUPLING
DIAGRAMS
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
ENERGY LEVELS
EXCITED STATES
HIGH-TC SUPERCONDUCTORS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
POLARONS
QUASI PARTICLES
SUPERCONDUCTORS
VIBRATIONAL STATES