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

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      https://www.ias.ac.in/article/fulltext/pram/069/02/0267-0275

    • Keywords

       

      Proximity effect; inhomogeneous superconductivity.

    • 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 $\sim 50$ 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.

    • Author Affiliations

       

      K Senapati1 R C Budhani1

      1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208 016, India
    • Dates

       
  • Pramana – Journal of Physics | News

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