Interplay between sheet resistance increase and magnetotransport properties in LaAlO3/SrTiO3

We find that the sheet resistance (R-s) of patterned samples of LaAlO3/SrTiO3 with a length scale of several microns may increase significantly at low temperatures in connection with driving electrical currents and applying in-plane magnetic fields. As the samples are warmed up, R-s recovers to its original value with accelerated recovery near 70 K and 160 K. Concomitantly with the increase in R-s, the carrier density and the mobility decrease and magnetotransport properties which may be linked to magnetism are suppressed.