Interplay between spin polarization and superconductivity in an ex-situ bilayer La0.67Ca0.33MnO3 - YBa2Cu3O7-x

Abstract

An anomalous magnetism is observed in an ex-situ bilayer of high-temperature superconductor YBa2Cu3O7-? (YBCO) and colossal magnetoresistive material La0.67Ca0.33MnO3 (LCMO). The magnetism results in strong in-plane anisotropy of the resistance and surprising double-peak feature in the temperature dependence of resistance associated with the interplay between superconducting transition and the establishment of the magnetic order in the interface. Magnetooptical-imaging (MOI) reveals a stripy magnetic ordering in the bilayer, that could explain the unusual behavior of the resistance. The magnetization measurements demonstrate strong and irreversible magnetism, which could be associated with reorientation of the magnetic moment of interface. The novel magnetic behavior could find practical use exploring the link between conductivity and magnetism of the interface. © 2017 Institute of Electrical and Electronics Engineers (IEEE)