title: Self-localization of composite spin-lattice polarons.
abstract: Self-localization of holes in the Holstein t-J model is studied in the adiabatic limit using exact diagonalization and the retraceable path approximation. It is shown that the critical electron-phonon coupling lambda c decreases with increasing J and that this behavior is determined mainly by the incoherent rather than by the coherent motion of the hole. The obtained spin correlation functions in the localized region can be understood within a percolation picture where antiferromagnetic order can persist up to a substantial hole doping. These results restrict the possibility of self-localization of holes in lightly doped cuprates.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Prelovsek
authors.forename: Roland
authors.initials: R
authors.lastname: Zeyher
authors.forename: Peter
authors.initials: P
authors.lastname: Horsch