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Pairing symmetry and capping layer influence of the superconductivity at FeSe/SrTiO<sub>3 </sub>interface

ORAL

Abstract

Single unit cell FeSe films on SrTiO3 have attracted growing attention due to the enhancement of the superconducting critical temperature (Tc) over its bulk value and the possibility of topological superconductivity. The pairing symmetry and mechanisms underlying the superconducting gap have been studied via angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling spectroscopy (STS). Here, we report the synthesis and characterization of ultrathin FeSe films grown on SrTiO3 by molecular beam epitaxy. We gain insight into the symmetry of the gap by measuring the angular dependence of the in-plane critical magnetic field. Additionally, to understand the discrepancy between Tc measured by in-situ techniques (such as STS and ARPES) and ex-situ transport, we investigate how Tc is influenced by varying the capping layer and Fermi energy. Supported by the University of Chicago, the Vannevar Bush Fellowship, and 2DCC-MIP/NSF DMR-1539916.

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Presenters

  • Yanan Li

    Pennsylvania State University

Authors

  • Yanan Li

    Pennsylvania State University

  • Timothy Pillsbury

    Department of Physics, The Pennsylvania State University, Penn Sate University, Pennsylvania State University, Physics, Pennsylvania State University

  • Grant Smith

    University of Chicago

  • Erzsebet Vincent

    University of Chicago

  • Anthony R. Richardella

    Department of Physics, The Pennsylvania State University, Pennsylvania State University, Physics, Pennsylvania State University

  • David Awschalom

    Pritzker School of Molecular Engineering, University of Chicago, University of Chicago

  • Nitin Samarth

    Penn State University, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, Pennsylvania State University