Ferromagnetism and sign-tunable anomalous hall effect in PdCoO<sub>2</sub> via hydrogenation

ORAL

Abstract

The metallic delafossites, which are among the highest conductivity materials, have recently emerged as an interesting system for materials research. In particular, PdCoO2 has an extremely long electron mean free path, and its layered crystal structure results in a large anisotropy between the in-plane and out-of-plane direction, making it an outstanding candidate for studying electronic behaviors. However, none of the delafossites are ferromagnetic, mainly as a result of the underlying triangular-lattice. However, we find that it is possible to make PdCoO2 films strongly ferromagnetic, via hydrogenation. In this process, the crystal transforms into a structure consisting of layers of intermixed Pd and Co, and results in a ferromagnet with strong out-of-plane anisotropy and a high Curie temperature of ~650 K. Furthermore, these films exhibit anomalous hall effect whose sign can be switched by controlling the hydrogenation parameters. This work shows that it is possible to introduce changes to the magnetic and electronic properties of delafossites via hydrogenation.

*This work is mainly supported by National Science Foundation (NSF) Grant No. DMR-2004125 and Army Research Office (ARO) Grant No. W911NF-20-1-0108.

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Presenters

  • Gaurab Rimal

    • Rutgers University, New Brunswick

Authors

  • Gaurab Rimal

    • Rutgers University, New Brunswick

  • Yiting Liu

    • Rutgers University, New Brunswick

  • Caleb Schmidt

    • Rutgers University, New Brunswick

  • Hussein Hijazi

    • Rutgers University, New Brunswick
    • Physics and astronomy, Rutgers University

  • Elizabeth Skoropata

    • Oak Ridge National Lab
    • Paul Scherrer Institute

  • Jason Lapano

    • Oak Ridge National Lab

  • Debangshu Mukherjee

    • Oak Ridge National Lab

  • Raymond R. Unocic

    • Oak Ridge National Lab

  • Matthew F Chisholm

    • Oak Ridge National Lab

  • Yifei Sun

    • Materials engineering, Purdue University

  • Matthew Brahlek

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory

  • Leonard C. Feldman

    • Rutgers University, New Brunswick

  • Shriram Ramanathan

    • School of Materials Engineering, Purdue University, West Lafayette, IN 47907
    • School of Materials Engineering, Purdue University
    • Materials engineering, Purdue University

  • Seongshik Oh

    • Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers, The State University of New Jersey
    • Rutgers, The State University of New Jersey
    • Department of Physics & Astronomy, Rutgers, The State University of New Jersey