Polaron formation and local magnetic moments in cuprate superconductors

Journal Article · Thu Dec 01 00:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.16094· OSTI ID:6937889

Lorenzana, J ^[1]; Dobry, A ^[2]

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1. Laboratory of Applied and Solid State Physics, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen (Netherlands)
2. Groupe de Physique Statistique, Universite de Cergy Pontoise, 47 Avenue des Genottes, 95806 Cergy Pontoise Cedex (France)

Exact diagonalization calculations show a continuous transition from delocalized to polaron behavior as a function of intersite electron-lattice coupling. A transition, found previously at the Hartree-Fock level between a magnetic and a nonmagnetic state, does not subsist when fluctuations are included. Local phonon modes become softer close to the polaron and by comparison with optical measurements of doped cuprates we conclude that they are close to the transition region between polaronic and nonpolaronic behavior. The barrier to adiabatically move a hole vanishes in that region suggesting large mobilities.

• OSTI ID: 6937889
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 50:21; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
POLARONS
DOPED MATERIALS
ELECTRON-PHONON COUPLING
HARTREE-FOCK METHOD
MAGNETIC MOMENTS
NUMERICAL SOLUTION
PHASE TRANSFORMATIONS
PHONONS
CALCULATION METHODS
COUPLING
MATERIALS
QUASI PARTICLES
SUPERCONDUCTORS
665411* - Basic Superconductivity Studies- (1992-)