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Growth of PdCoO<sub>2</sub> films with controlled termination by MBE and determination of their electronic structure by ARPES

ORAL

Abstract

Utilizing the powerful combination of molecular-beam epitaxy (MBE) and angle-resolved photoemission spectroscopy (ARPES) we produce and study the effect of different terminating

layers on the electronic structure of the metallic delafossite PdCoO2. Attempts to introduce unpaired electrons and synthesize new antiferromagnetic metals akin to the isostructural compound PdCrO2 have been made by replacing cobalt with iron in PdCoO2 films grown by MBE. Using ARPES, we observe similar bulk bands in these PdCoO2 films with Pd-, CoO2-, and FeO2-termination. Nevertheless, Pd- and CoO2-terminated films show a reduced intensity of surface states. Additionally, we are able to epitaxially stabilize PdFexCo1−xO2 films which show an anomaly in the derivative of the electrical resistance with respect to temperature at 20 K, but do not display pronounced magnetic order.

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Publication: Song, Q. et al. Growth of PdCoO2 films with controlled termination by molecular-beam epitaxy and determination of their electronic structure by angle-resolved photoemission spectroscopy. APL Mater. 10, 091113 (2022).

Presenters

  • Qi Song

    Cornell University

Authors

  • Qi Song

    Cornell University

  • Jiaxin Sun

    Cornell university

  • Christopher T Parzyck

    Cornell University, Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA

  • Ludi Miao

    Cornell University

  • Qing Xu

    Cornell University

  • Felix V Hensling

    Cornell University

  • Matthew R Barone

    Department of Materials Science and Engineering, Cornell University

  • Cheng Hu

    Cornell university

  • Jinkwon Kim

    Cornell University

  • Brendan D Faeth

    Cornell University

  • Hanjong Paik

    University of Oklahoma, Cornell University

  • Philip King

    Univ of St Andrews

  • Kyle M Shen

    Cornell University

  • Darrell G Schlom

    Cornell University, Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA, Department of Materials Science and Engineering, Cornell University