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Anomalous Hall effect with colossal magnetic saturation and coercivity in (111)-oriented pyrochlore Eu<sub>2</sub>Ir<sub>2</sub>O<sub>7</sub> thin films

ORAL

Abstract

The pyrochlore iridates are a class of candidate materials for the topological Weyl semimetal, which can host hidden topological and magnetic phases in the thin film form. To investigate the intrinsic properties relevant to the Ir sublattices, we fabricated high-quality epitaxial (111)-oriented pyrochlore Eu2Ir2O7 thin films on YSZ substrates, in which the Eu3+ ions are magnetically silent. Temperature-dependent transport reveals an onset of the metal-insulator transition at TC around 110 K, similar to the bulk value. However, magneto-transport measurements reveal that below TC in the insulating phase with the non-colinear all-in-all-out antiferromagnetic order, a distinct anomalous Hall effect (AHE) emerges combined with a butterfly-shape hysteretic magnetoresistance. The AHE gets strongly pronounced at lower temperatures, with colossal enhancement of both the saturation field HS and the coercivity HC. These findings are signatures of the emergent interacting topological phases in thin films of [111]-oriented pyrochlore iridates.

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Presenters

  • Xiaoran Liu

    Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick, Rutgers University

Authors

  • Xiaoran Liu

    Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick, Rutgers University

  • Wenbo Ge

    Department of Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick

  • Mikhail Kareev

    Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick, Rutgers University

  • Fangdi Wen

    Rutgers University, New Brunswick

  • Eun Sang Choi

    Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Field Magnet Laboratory, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Lab

  • Weida Wu

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

  • Jak Chakhalian

    Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick, Rutgers University