Abstract
We report magnetotransport and magnetization studies of heterostructures comprising alternately stackedY Ba2Cu3O7−δ (YBCO) andLa1−xPbxMnO3 (LPMO)layers. The c-axis-oriented bi-layer and four-layer YBCO/LPMO heterostructures were prepared in situ on (100)SrTiO3 substrates using pulsed laser deposition. Zero-field-cooled (ZFC) and field-cooled (FC)magnetization data show that in a four-layer structure the LPMO layers becomeantiferromagnetically coupled when the thermodynamic-fluctuation-induced Cooper pairingbegins in the YBCO layers, which is well supported by the magnetization versus appliedfield data. Evidence of antiferromagnetic coupling is also reflected in the temperaturedependence of the magnetoresistance.
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