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