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.
@article{arxiv.cond-mat/0012512,
title = {Current-induced conductance switching in epitaxial La0.7Sr0.3MnO3/SrTiO3 multilayers},
author = {K. Doerr and K. -H. Mueller and T. Walter and M. Sahana and D. Eckert and K. Nenkov and L. Schultz and K. Brand and M. Lehmann},
journal= {arXiv preprint arXiv:cond-mat/0012512},
year = {2009}
}