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The role of the interface in La<sub>0.67</sub>Sr<sub>0.33</sub>MnO<sub>3</sub>/YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> heterostructures probed by polarized neutron reflectometry

ORAL

Abstract

The interplay of ferromagnetism and superconductivity at interfaces can lead to proximity effects, spin valve behavior, and spin triplet pairing, with the interface playing an important role. To further explore this role, we have studied magnetotransport in YBa2Cu3O7-δ (YBCO)/La0.67Sr0.33MnO3 (LSMO) heterostructures fabricated via pulsed laser deposition on (LaAlO3)0.3(Sr2TaAlO6)0.7 (LSAT) (001) substrates. We compare the electronic and magnetic properties of LSMO/YBCO/LSMO trilayers with YBCO/LSMO and LSMO/YBCO bilayers to separate contributions from each interface from spin valve behavior in the magnetoresistance of the samples. All samples show magnetoresistance peaks at low field, indicating the peak is due to stray fields from the LSMO layers rather than spin valve behavior. Polarized neutron reflectometry highlights the importance of the interface. All samples show a 2-3 nm thick disordered layer at each LSMO/YBCO interface, which may prevent the LSMO layers from coupling through the YBCO layer in the trilayer heterostructures and inhibit large magnetoresistance due to spin valve behavior.

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Presenters

  • Jacob Wisser

    Stanford Univ

Authors

  • Jacob Wisser

    Stanford Univ

  • Alexander Grutter

    National Institute of Standards and Technology, Center for Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, NIST, NIST Gaithersburg

  • Patrick Quarterman

    National Institute of Standards and Technology, Center for Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, NIST

  • Purnima Parvathy Balakrishnan

    National Institute of Standards and Technology, NIST Center for Neutron Research, NIST

  • Brian James Kirby

    NCNR, National Institute of Standards and Technology, National Institute of Standards and Technology, Center for Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, NIST

  • Yuri Suzuki

    Department of Applied Physics, Stanford University, Applied Physics, Stanford University, Stanford University, Stanford Univ