Abstract
La0.7Sr0.3MnO3/YBa2Cu3O7/La0.7Sr0.3MnO3 (LSMO/YBCO/LSMO) heterostructures were prepared by pulsed laser deposition technique. The resistivity–temperature (ρ–T) variation and magnetoresistance effects of these heterostructures have been studied and are found to be dependent on the thickness of superconducting spacer layer. We have observed that metal–insulator (TMI) transition get suppressed with increase in thickness of the spacer layer. The maximum magnetoresistance ratio ∼70% at 266K and ∼65% at 254K temperature are observed for 50nm and 100nm spacer layers respectively. In LSMO(200nm)/YBCO(50nm)/LSMO(200nm) specimen the temperature coefficient of resistance (TCR) is ∼6.63%K−1 which can be useful for bolometric performances and temperature sensors.
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