Abstract
Epitaxial ferromagnetic $({\mathrm{La}}_{0.5}{\mathrm{Sr}}_{0.5}\mathrm{Co}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}})$/superconducting $(\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}})$/ferromagnetic $({\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}})$ trilayers are grown by pulsed laser deposition. The magnetotransport studies reveal that a much lower magnetic field is required to suppress the superconductivity in the trilayer. Moreover, the superconducting ${T}_{c}$ is markedly different for the trilayer system when the magnetic field is applied parallel to the $c$ axis compared to that perpendicular to the $c$ axis $({T}_{c\ensuremath{\parallel}c\phantom{\rule{0.3em}{0ex}}\text{axis}}<{T}_{c\ensuremath{\perp}c\phantom{\rule{0.3em}{0ex}}\text{axis}})$. The trilayer system also exhibits a huge $+\mathit{ve}$ magnetoresistance below superconducting ${T}_{c}$, which could arise due to vortex dissipation in the liquid state of a superconductor in the trilayer structure.
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