Superconductivity in Nd<sub>x</sub>Sr<sub>1-x</sub>TiO<sub>3</sub> Films Grown using Hybrid Molecular Beam Epitaxy

ORAL

Abstract

We present experimental results showing superconductivity in NdxSr1-xTiO3 thin films (50-250 nm) grown using hybrid MBE approach, where Nd3+ is expected to carry net magnetic moment. We measure anisotropic resistance along the two orthogonal in-plane channels. In the high resistance direction we observe a smooth transition from metallic to superconducting state at a critical temperature (Tc ~ 0.2K). However, along the low resistance channel the resistance rises by up to an order of magnitude near Tc before turning superconducting. We discuss these results in the context of anisotropic in-plane Josephson coupling. Furthermore, the out of plane upper critical field (Hc2) as a function of temperature shows opposite curvature from what is expected based on Wethamer-Helfand-Hohenberg theory, and does not saturate down to ~0.12K. We discuss possible explanations, including effects related to magnetic impurities (Nd3+) and two-band superconductivity.

*This work was funded in part by the NSF-supported University of Minnesota MRSEC

–

Presenters

  • Yilikal Ayino

    • School of Physics and Astronomy, University of Minnesota
    • Univ of Minnesota - Twin Cities

Authors

  • Yilikal Ayino

    • School of Physics and Astronomy, University of Minnesota
    • Univ of Minnesota - Twin Cities

  • Jin Yue

    • Department of Chemical Engineering and Materials Science, University of Minnesota
    • Univ of Minnesota - Twin Cities
    • Chemical Engineering & Materials Science, University of Minnesota

  • Xinxin Cai

    • School of Physics and Astronomy, University of Minnesota
    • Pennsylvania State Univ
    • Univ of Minnesota - Twin Cities

  • Tianqi Wang

    • Chemical Engineering and Materials Science, University of Minnesota
    • Univ of Minnesota - Twin Cities

  • Laxman Thoutam

    • Chemical Engineering and Materials Science, University of Minnesota
    • Univ of Minnesota - Twin Cities

  • Bharat Jalan

    • Department of Chemical Engineering and Materials Science, University of Minnesota
    • Chemical Engineering and Materials Science, University of Minnesota
    • Univ of Minnesota - Twin Cities
    • Chemical Engineering & Materials Science, University of Minnesota
    • Chemical Engineering and Materials Science, Univ of Minnesota - Twin Cities

  • Vlad Pribiag

    • School of Physics and Astronomy, University of Minnesota
    • Univ of Minnesota - Twin Cities