Polaronic anharmonicity in the Holstein-Hubbard model
- 7 September 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 69 (10) , 1600-1603
- https://doi.org/10.1103/physrevlett.69.1600
Abstract
We demonstrate for the nearly half-filled Holstein-Hubbard model that the presence of antiferomagnetic spin correlations can cause polaronic carrier self-localization, and hence a strongly anharmonic lattice potential, already at moderate electron-phonon coupling strengths λ∼0.2–0.4, up to substantial hole dopant concentrations ∼(20–30)%. The results are compared to recent observations of anharmonicity in the apical oxygen c-axis motion of cuprate superconductors.
Keywords
This publication has 59 references indexed in Scilit:
- Studies of polaron motion: Part II. The “small” polaronPublished by Elsevier ,2004
- Derivation of a one-band Hubbard model for CuO planar materialsPhysical Review B, 1991
- Anharmonic phonons and the anomalous isotope effect inLa2−xSrxCuO4Physical Review B, 1991
- Anharmonic phonons and the isotope effect in superconductivityPhysical Review B, 1991
- Small-polaron theory of doped antiferromagnetsPhysical Review Letters, 1991
- Hole-quasiparticle band narrowing in the two-dimensionalt-JmodelPhysical Review B, 1990
- Ion-channeling anomalies at the superconducting transition temperature in single-crystalPhysical Review B, 1990
- Magnetic interactions and charge transfer excitations in copper oxide superconductorsJournal of the Less Common Metals, 1989
- The Axial Oxygen Atom and Superconductivity in YBa 2 Cu 3 O 7Science, 1989
- Studies of polaron motionAnnals of Physics, 1959