Abstract
An experimental study of proximity effect in La0.67Sr0.33MnO3-YBa2CU3O7-La0.67Sr0.33MnO3 trilayers is reported. Transport measurements on these samples show clear oscillations in critical current (Ic) as the thickness of La0.67Sr0.33MnO3 layers (dF) is scanned from ∼50 A to ∼ 1100 A. In the light of existing theories of ferromagnet-superconductor (FM-SC) heterostructures, this observation suggests a long range proximity effect in the manganite, modulated by its weak exchange energy (∼2 meV). The observed modulation of the magnetic coupling between the ferromagnetic LSMO layers as a function of dF, also suggests an oscillatory behavior of the SC order parameter near the FM-SC interface.
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