Mapping the magnetic and electronic structure of (Eu<sub>1-x</sub>Ca<sub>1-x</sub>)<sub>2</sub>Ir<sub>2</sub>O<sub>7 </sub>across a global metal-insulator transition

ORAL

Abstract

Motivated by the prediction of quantum critical behavior with the suppression of the temperature dependent metal-insulator transition in Ln2Ir2O7 (Ln = Y, lanthanide), including the formation of a topological semi-metal phase1,2, we present characterization of polycrystalline samples for the series (Eu1-xCa1-x)2Ir2O7. Doping completely suppresses the MIT with only a weak decrease in the magnetic transition, leading to a fully metallic state that retains the bulk magnetism of the x = 0 compound. XRD and XAS suggest that the change of TMIT occurs due to an interplay between bandwidth tuning via a change in the Ir-O-Ir bond angle as well as filling control. X-ray PDF shows no changes in short-range order associated with either the MIT or the magnetic transition, additionally confirming that Ca-doping does not result in significant phase separation. Preliminary XMCD data probing the magnetic state across the MIT will be discussed.”.
1. L. Savary et al. Phys. Rev. X 4, (2014)
2. X. Wan et al. Phys. Rev. B 83, (2011)

*This work was supported by ARO Grant W911NF-16-1-0361.

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Presenters

  • Eli Zoghlin

    • University of California, Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials, University of California, Santa Barbara

Authors

  • Eli Zoghlin

    • University of California, Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials, University of California, Santa Barbara

  • Zach Porter

    • Materials, University of California, Santa Barbara
    • University of California, Santa Barbara

  • Geneva Laurita

    • Chemistry and Biochemistry, Bates College
    • Bates College

  • Daniel Haskel

    • Advanced Photon Source, Argonne National Laboratory
    • Advanced Photon Source
    • Argonne National Lab

  • Yongseong Choi

    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory
    • Advanced Photon Source
    • Argonne National Lab

  • Stephen Wilson

    • University of California, Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials, University of California Santa Barbara
    • Materials, University of California, Santa Barbara
    • UC Santa Barbara