Spectroscopic and atomic structure of novel ternary pnictides by ARPES and STM

ORAL

Abstract

Pnictide materials have been found to host a number of exotic and correlated states of matter including superconductivity, charge/spin density waves, and topological states. The ternary layered pnictides are a family of particular interest due to their tendency to undergo a number of low-temperature structural transitions of seemingly disparate origins and elusive topological and semi-metallic character. Here, we present angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy and spectroscopy (STM/STS) studies of novel ternary pnictides which probe the electronic, lattice, and magnetic structure. Our ARPES measurements reveal a two-dimensional hole-like circular Fermi surface, in good agreement with DFT calculations. Atomically-resolved STM/STS mapping measurements at finite magnetic field show an electronically heterogeneous surface with multiple atomic surface terminations that are peppered with spectroscopically bright atomic defects.

*This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231

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Presenters

  • Morgaine I Mandigo-Stoba

    • University of California, Los Angeles

Authors

  • Morgaine I Mandigo-Stoba

    • University of California, Los Angeles

  • J Green

    • University of California, Los Angeles

  • Kuan-Yu Wey

    • University of California, Los Angeles

  • Asari G Prado

    • University of California, Los Angeles

  • Christopher Jozwiak

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

  • Aaron Bostwick

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

  • Eli Rotenberg

    • Lawrence Berkeley National Laboratory

  • Ni Ni

    • University of California, Los Angeles

  • Christopher Gutierrez

    • University of California Los Angeles