Transport properties of La0.7Sr0.3MnO3/YBa2Cu3O7-δ (LSMO/YBCO) heterostructure

We report on the transport properties of La0.7Sr0.3MnO3 (200 nm)/YBa2Cu3O7-delta (50 nm) (LSMO/YBCO) heterostructure in the presence and absence of magnetic field, deposited on LaAlO3 (001) substrate using pulsed laser deposition technique. X-ray diffraction pattern confirms that the grown heterostructure is single phase in nature. The temperature dependent resistivity shows a metallic behavior below 304 K, superconductivity is completely suppressed by the presence of thick LSMO layer. From resistivity-temperature (rho-T) curve, we have also observed the metal to insulator transition temperature at 304 K and increases to higher temperature side (353 K) on the application of magnetic field. We found a maximum magnetoresistance ratio similar to 47% at 246 K temperature. Temperature co-efficient of resistance is similar to 1.7 % K-1 at 202 K, can be useful for bolometric performances and temperature sensors.