Electronic dispersion in the CE charge/orbital-ordered phase of LaSr$_{2}$Mn$_{2}$O$_{7}$ revealed by ARPES

ORAL

Abstract

Using angle-resolved photoemission spectroscopy, we investigated the E vs. $k$ dispersion of electrons in the CE charge/orbital-ordered phase of bi-layer manganite LaSr$_{2}$Mn$_{2}$O$_{7}$. We found that the Bloch band of hopping electrons is well maintained with a dispersion qualitatively different from various band calculations based on the zigzag chains in the CE phase. By comparing the dispersions and spectral weight in the CE-AFM, CE-PM and A-type AFM states, we~reveal the~strong influences of spin, charge, and orbital on electron hopping amplitudes.

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Authors

  • Zhe Sun

  • Qiang Wang

    • University of Colorado at Boulder

  • Alexei V. Fedorov

    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Hong Zheng

    • Argonne National Laboratory

  • John Mitchell

    • Argonne National Laboratory
    • Materials Science Division, Argonne National Laboratory
    • ANL

  • Daniel Dassau

    • University of Colorado at Boulder