Current-induced conductance switching in epitaxial La0.7Sr0.3MnO3/SrTiO3   multilayers
  We report on the non-linear in-plane electrical transport in coherently grown [La0.7Sr0.3MnO3/SrTiO3] multilayers with ultrathin (< 3 nm) single layers. Current-induced switching of the conductance, with low conductance at larger currents, is demonstrated. The conductance switching is modified under a magnetic field, resulting in an extremely large magnetoresistance of negative, or in a special case even positive, sign. Our results suggest a percolative nature of transport where a large local current density gives rise to a spin-polarizing and a thermal effect of current. 
K. Doerr, K.-H. Mueller, T. Walter, M. Sahana, D. Eckert, K. Nenkov,   L. Schultz, K. Brand, M. Lehmann