Vector field STM study of iron-based superconductor

ORAL

Abstract

Magnetic field studies of iron-based superconductors have been largely limited to c-axis applied fields. Using a combination of a vector magnetic field and high resolution scanning tunneling microscopy/spectroscopy, we study the three dimensional field based phase diagram of vortex electronic matter in a correlated iron-based superconductor. We find that the lattice structure of the vortices is strongly correlated with the magnitude and direction of the magnetic field in an anisotropic manner. Probing the quasiparticle excitations and interferences reveals an unusual magnetic pair-breaking effect with distinct scattering vectors. These results will help us understand the interplay between Cooper pairing and emergent three dimensional vortex matter in iron-based superconductors.

*Work at Princeton was supported by the US DOE under Basic Energy Sciences (Grant No. DOE/BES DE-FG-02-05ER46200).

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Presenters

  • Songtian Sonia Zhang

    • Princeton Univ
    • Princeton University

Authors

  • Songtian Sonia Zhang

    • Princeton Univ
    • Princeton University

  • Jiaxin Yin

    • Princeton Univ

  • Guangyang Dai

    • Chinese Academy of Sciences

  • Hao Zheng

    • Shanghai Jiao Tong University
    • Shanghai Jiao Tong Univ
    • Princeton Univ

  • Guoqing Chang

    • National University of Singapore
    • Institute of Physics, Academica Sinica
    • Institute of Physics, Academia Sinica
    • Princeton Univ
    • National U. of Singapore

  • Ilya Belopolski

    • Princeton Univ
    • Princeton University
    • Princeton U.

  • Xiancheng Wang

    • Institute of Physics, Chinese Academy of Sciences
    • Chinese Academy of Sciences

  • Hsin Lin

    • Academia Sinica
    • National University of Singapore
    • Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    • Institute of Physics, Academica Sinica
    • Institute of Physics, Academia Sinica
    • National U. of Singapore
    • Natl Univ of Singapore
    • National University of Signapore

  • Ziqiang Wang

    • Boston College
    • Department of Physics, Boston Coll
    • Boston university
    • Department of Physics, Boston College
    • Boston Coll

  • Changqing Jin

    • Chinese Academy of Sciences

  • Zahid Hasan

    • Princeton Univ
    • Princeton University
    • Princeton U.