Effects of epitaxial strain and oxygen underdoping on superconductivity in manganite/cuprate thin-film heterostructures

ORAL

Abstract

To distinguish the role of magnetism from other factors that affect superconductivity in c-axis La2/3Ca1/3MnO3/YBa2Cu3O7-δ (LCMO/YBCO) heterostructures, we grow and characterize various perovskite/YBCO/perovskite trilayers, using ferromagnetic LCMO, paramagnetic LaNiO3 (LNO), and orthorhombic PrBa2Cu3O7-δ (PBCO) as the sandwiching layers. LCMO and LNO trilayers show similarly large superconducting Tc reductions with decreasing YBCO layer thickness, whereas this Tc reduction is not seen in the PBCO trilayers. Our results indicate that epitaxial strain has a stronger effect on the Tc of LCMO/YBCO heterostructures than any long-range magnetic proximity effect present. [1] Using this system, we also study how the Tc reduction varies with oxygen underdoping by deoxygenating the cuprate layer. We discuss our results in the wider context of multiple competing orders, in particular the recent observation by resonant x-ray scattering of robust charge-density-wave order in LCMO/YBCO multilayers. [2]
[1] H. Zhang et al., arXiv:1710.10668v1 [cond-mat.supr-con]
[2] A. Frano et. al., Nat. Materials 15:831 (2016)

*Work supported by NSERC, CFI-OIT and the Canadian Institute for Advanced Research

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Presenters

  • Chao Zhang

    • Department of Physics, University of Toronto
    • Physics, University of Toronto

Authors

  • Chao Zhang

    • Department of Physics, University of Toronto
    • Physics, University of Toronto

  • Hao Zhang

    • Department of Physics, University of Toronto

  • Anh Nguyen

    • Department of Physics and Astronomy, California State University Long Beach

  • Thomas Gredig

    • Department of Physics, California State University - Long Beach
    • Department of Physics and Astronomy, California State University Long Beach
    • California State University, Long Beach

  • Min Gu Kang

    • Massachusetts Institute of Technology, Department of Physics
    • Massachusetts Institute of Technology

  • Riccardo Comin

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology, Department of Physics
    • Department of Physics, Massachusetts Institute of Technology
    • Stuart Blussom Quantum Matter Institute, University of British Columbia

  • John Y.T. Wei

    • Department of Physics, University of Toronto
    • Physics, University of Toronto