Magnetic field dependence of Interface Superconductivity in LSCO/LCO bilayers

Interface superconductivity (IS) with a high T$_{c}$ has been discovered recently in bi-layer films consisting of a thin layer of La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ (overdoped and metallic but not superconducting) covered with a thin layer of La$_{2}$CuO$_{4}$ (undoped, insulating, and antiferromagnetic) grown by molecular beam epitaxy (MBE)$^{1}$. Here we report on a study of magneto-transport properties in such IS systems. By measuring the magnetic-field dependence of in-plane longitudinal and Hall resistivities we find the temperature dependence of the upper critical field (H$_{c2})$. Other findings and inferences on the nature of IS and T$_{c}$ enhancement will be discussed as well. $^{1}$A. Gozar, G. Logvenov, A. T. Bollinger and I. Bozovic, ``Interface superconductivity between a metal and a Mott insulator'', submitted for publication.