Anomalous magneto-transport at the superconducting interface between LaAlO_3 and SrTiO_3

摘要

The magnetoresistance as a function of temperature and field for atomically flat interfaces between 8 unit cells of LaAlO_3 and SrTiO_3 is reported. Anomalous anisotropic behavior of the magnetoresistance is observed below 30 K for superconducting samples with carrier concentration of 3.5 × 10~(13) cm~(-2). We associate this behavior to a magnetic order formed at the interface.