• R C Budhani

      Articles written in Pramana – Journal of Physics

    • Appearance of an inhomogeneous superconducting state in La0.67Sr0.33MnO3–YBa2Cu3O7–La0.67Sr0.33MnO3 trilayers

      K Senapati R C Budhani

      More Details Abstract Fulltext PDF

      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 $\sim 50$ Å to $\sim 1100$ Å. 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 ($\sim 2$ 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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