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Manipulating superconductivity in Sr<sub>2</sub>RuO<sub>4</sub> thin films through epitaxial strain

ORAL

Abstract

Pushing the van Hove singularity in the γ band of Sr2RuO4 towards the Fermi level can potentially raise the transition temperature, Tc, of this unconventional superconductor. To test this concept, we explore the effect of biaxial strains from –0.9% to +1.0% imposed by commensurate epitaxy on (NdAlO3)0.39—(SrAl1/2Ta1/2O3)0.61 (NSAT), NdGaO3, (LaAlO3)0.29—(SrAl1/2Ta1/2O3)0.71 (LSAT), LaGaO3, and SrTiO3 substrates on the superconducting Tc and upper critical field Hc2 of Sr2RuO4 thin films. These biaxial strain studies are distinct from and compliment the existing uniaxial strain studies on Sr2RuO4 single crystals. Mean free paths up to 144 nm are observed in Shubnikov-de Haas oscillation measurements on these thin films and Tcs range from 1 K to 1.8 K for films with similar residual resistivities. The measured mean free paths in combination with the coherence lengths, determined from upper critical field measurements, established that all films are superconducting in the clean limit.

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Presenters

  • Hari Nair

    Cornell University, Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University

Authors

  • Hari Nair

    Cornell University, Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University

  • Nathaniel Schreiber

    Cornell University

  • Jacob Ruf

    Cornell University

  • Ludi Miao

    Cornell University, Laboratory of Atomic and Solid State Physics, Department of Physics, Kavli Institute at Cornell for Nanoscale Science, Cornell University, Laboratory of Atomic and Solid State Physics, Cornell University

  • Yawen Fang

    Cornell University, Cornell university

  • Yonghun Lee

    Cornell University

  • Mario Brützam

    Leibniz-Institut für Kristallzüchtung

  • Christo Guguschev

    Leibniz-Institut für Kristallzüchtung

  • Brad J Ramshaw

    Cornell University, Cornell university, Cornell

  • Kyle M Shen

    Cornell University, Department of Physics, Cornell University, Cornell University, Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Laboratory of Atomic and Solid State Physics, Department of Physics, Kavli Institute at Cornell for Nanoscale Science, Cornell University

  • Darrell Schlom

    Cornell University, Department of Materials Science and Engineering, Cornell University, Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University, Materials Science and Engineering, Cornell University, Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA, Platform for the Accelerated Realization, Analysis, & Discovery of Interface Materials (PARADIM), Cornell University