Conducting Jahn-Teller domain walls in undoped manganites...

We investigate the electronic properties of multidomain configurations in models for undoped manganites by
means of variational and Monte Carlo techniques. These materials display simultaneous Jahn-Teller distortions
and magnetic ordering. We find that a band of electronic states appears associated with Jahn-Teller domain
walls, and this band is localized in the direction perpendicular to the walls. The energy and width of this band
depend on the conformational properties of the domain walls. At finite temperatures, the conductance along the
domain walls, induced by the localized domain-wall bands, is orders magnitude larger than in the bulk.