Appearance of an inhomogeneous superconducting state in La0.67Sr0.33MnO3-YBa2Cu3O7-La0.67Sr0.33MnO3 trilayers |
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Authors: | K Senapati and R C Budhani |
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Institution: | (1) Department of Physics, Indian Institute of Technology Kanpur, Kanpur, 208 016, India |
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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 (I
c) as the thickness of La0.67Sr0.33MnO3 layers (d
F) is scanned from ∼50 ? to ∼ 1100 ?. 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 d
F, also suggests an oscillatory behavior of the SC order parameter near the FM-SC interface.
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Keywords: | Proximity effect inhomogeneous superconductivity |
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