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Neutron spectroscopy measurements reveal short-range spin correlations nearand above the ferromagnetic-paramagnetic phase transition in manganitematerials of the form La$_{1-x}A_{x}$MnO$_{3}$, including samples with aninsulating ground state as well as colossal magnetoresistive samples with ametallic ground state. Quasielastic magnetic scattering is revealed that formsclear ridges running along the [100]-type directions in momentum space. Asimple model consisting of a conduction electron hopping between spin polarizedMn ions that becomes self-trapped after a few hops captures the essentialphysics of this magnetic component of the scattering. We associate thisscattering component with the magnetic part of diffuse polarons, as we observea temperature dependence similar to that of the diffuse structural scatteringarising from individual polarons.

Polaron-mediated spin correlations in metallic and insulating La$_{1-x}A_{x}$MnO$_{3}$ ($A$=Ca, Sr, or Ba)