Microstrain and polaronic correlation in a model system

Abstract

We have studied the effect that variations of the local microstrain have on the polaronic correlation function obtained from the exact diagonalization of a simple model Hamiltonian. Although the correlation function exhibits a monotonic behavior as a function of the hole hopping parameter, and thus microstrain, its isotopic shift exhibits a maximum for specific values of t. This result suggests that if there is a coupling between polaronic objects and free carriers, coexisting in high-Tc cuprate superconductors, then this will manifest not only in the superconducting transition, but also on the properties directly related to the polaron formation in these materials. © 2008 IOP Publishing Ltd.