Superconductivity switched by spin-current and enhanced by forward-scattering interfacial phonons in heterostructure iron-based superconductor

ORAL

Abstract

Heterostructure iron-based superconductor made by self-assembly of FeAs monolayers atomically coupled with perovskite bilayers have attracted significant interest due to the possibilities of magnetic frustrations and existence of forward-scattering interfacial phonons. Using variable temperature and magnetic field spin-polarized scanning tunneling microscopy [1] and density-functional-theory calculations, we show that the magnetic symmetries in the Fe-layer of Sr2VO3FeAs are indeed metastable and as a result the superconductivity can be switched in nanometer-scale by changing the magnetic symmetry with spin-polarized or unpolarized tunneling current below the bulk Fe magnetic ordering temperature [2]. This may introduce possibilities of fast spintronic transistors controlling iron-based superconductivity. We also performed high-resolution quasiparticle interference (QPI) measurements and self-consistent BCS-theory-based QPI simulations to provide direct atomic-scale proofs of enhancement of iron-based superconductivity due to the BCS mechanism based on forward-scattering interfacial phonons [3].
[1] J.-O. Jung et al., Rev. Sci. Instrum. 88, 103702 (2017)
[2] J. Choi et al., Phys. Rev. Lett. (in print), arXiv:1707.01191
[3] J. Choi et al., Phys. Rev. Lett. 119, 107003 (2017)

–

Presenters

  • Jhinhwan Lee

    Physics, KAIST, Korea Advanced Institute of Science and Technology, Department of Physics, KAIST

Authors

  • Jhinhwan Lee

    Physics, KAIST, Korea Advanced Institute of Science and Technology, Department of Physics, KAIST

  • Seokhwan Choi

    Department of Physics, KAIST, Physics, KAIST

  • Jinoh Jung

    Physics, KAIST

  • Yeonghoon Lee

    Physics, KAIST, Department of Physics, KAIST

  • SungBin Lee

    Physics, KAIST, Korea Adv Inst of Sci & Tech, Department of Physics, KAIST

  • Yannis Semertzidis

    Physics, KAIST

  • Jong Ok

    Physics, POSTECH, POSTECH, Department of Physics, POSTECH, Physics, Postech, Pohang University of Science and Technology

  • Jun Sung Kim

    Physics, POSTECH, Physics, Pohang Univ of Sci & Tech, POSTECH, Department of Physics, POSTECH, Physics, Postech, Department of Physics, Pohang University of Science and Technology, Pohang University of Science and Technology

  • Steven Johnston

    Univ. of Tennessee, Univ of Tennessee, Physics, Univ of Tennessee, Knoxville, Physics and Astronomy, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Physics, Univ. of Tennessee, physics and astronomy, University of Tennessee, Department of Physics and Astronomy, Univ of Tennessee, Knoxville

  • Hyoung Joon Choi

    Physics, Yonsei University, Department of Physics and Center for Computational Studies of Advanced Electronic Material Properties, Yonsei University, Physics, Yonsei Univ., Dept. of Physics, Yonsei University, Department of Physics, Yonsei University, Department of Physics, Center for Computational Studies of Advanced Electronic Material Properties, Yonsei University, Institute of Physics and Applied Physics, Yonsei University, Department of Physics, and Center for Computational Studies of Advanced Electronic Material Properties, Yonsei University

  • Yunkyu Bang

    Department of Physics, Chonnam National University, Physics, Chonnam Nat. Univ.

  • Sang-Wook Cheong

    Rutgers University, Department of Physics and Astronomy, Rutgers University, Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Physics, Rutgers University, Physics and Astronomy, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Physics and Astronomy, Rutgers Univ., Rutgers Univ, Physics, Rutgers Univesity, Department of Physics, Rutgers University, Physics and Astronomy, Rutgers Center for Emergent Materials, Department of Physics & Astronomy , Rutgers University

  • Andreas Heinrich

    Center for Quantum Nanoscience, Institute for Basic Science, Ewha Womans University, Center for Quantum Nanoscience, Institute for Basic Science (IBS), Physics, Ewha W. Univ.

  • Won-Jun Jang

    Center for Quantum Nanoscience, Institute for Basic Science, Center for Quantum Nanoscience, Institute for Basic Science (IBS), Physics, Ewha W. Univ.

  • Alex Lee

    Department of Applied Physics and Applied Mathematics, Columbia University, Applied Physics, Columbia Univ.