Static Nematic Electronic Structure in the ``Parent'' State of the Iron-Based Superconductor Ca(Fe$_{1-x}$Cox)$_{2}$As$_{2}$

ORAL

Abstract

We use spectroscopic imaging STM to study the electronic structure of CaFe$_{1.94}$Co$_{0.06}$As$_{2}$ in the antiferromagnetic and orthorhombic `parent' state from which the iron-based high temperature superconductivity emerges with increased carrier density. We find static unidirectional nanostructures self similar at $\sim $ 8 a$_{FeFe}$, aligned along the crystalline a (AFM) axis. This introduces an unidirectionality (nematicity) much stronger than one could expect from the musicale lattice distortion; on a lengthscale different than the AFM lengthscale.

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Authors

  • Milan P. Allan

    • Cornell University

  • Tien-Ming Chuang

    • Cornell University

  • Jinho Lee

    • Brookhaven National Laboratory
    • Cornell University, Brookhaven National Lab

  • Yang Xie

    • Cornell University

  • N. Ni

    • Ames Laboratory and Iowa State University, IA, USA
    • Ames Laboratory / Iowa State University
    • Ames Laboratory
    • Dept of Physics/Ames Laboratory, Iowa State University
    • Department of Physics and Astronomy, Iowa State University

  • S.L. Bud'ko

    • Ames Laboratory and Iowa State University, IA, USA
    • Ames Laboratory / Iowa State University
    • Ames Laboratory
    • Ames Laboratory/Iowa State University
    • Dept of Physics/Ames Laboratory, Iowa State University
    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University

  • Greg Boebinger

    • National High Magnetic Field Laboratory
    • NHMFL/FSU

  • P.C. Canfield

    • Ames Laboratory and Iowa State University, IA, USA
    • Ames Laboratory / Iowa State University
    • Ames Laboratory
    • Dept of Physics/Ames Laboratory, Iowa State University
    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University
    • Ames Laboratory/Iowa State University

  • J.C. Davis

    • Cornell University
    • Cornell University, Brookhaven National Lab, University of St. Andrews
    • Cornell University, University of St. Andrews, Brookhaven National Laboratory
    • Cornell U., BNL, U. of St. Andrews, U. of British Columbia