Study on the magnetic properties of ${\mathrm{Y}_{2-x}\mathrm{Bi}_{x}\mathrm{Ir}_{2}\mathrm{O}_{7}}$ by ${\mu}$SR and DC susceptibility

ORAL

Abstract

Pyrochlore iridates have received considerable attention recently as they possess strong electron correlation and spin orbit coupling, giving rise to a finite temperature metal-insulator transition (MIT). The nature of this MIT transition is related to the magnetic order of the Ir atoms which also experience frustration. By doping ${\mathrm{Y}_{2}\mathrm{Ir}_{2}\mathrm{O}_{7}}$ with Bi we are trying to elucidate the magnetic configuration of the iridium ions. Here we present a study on the magnetic properties of the ${\mathrm{Y}_{2-x}\mathrm{Bi}_{x}\mathrm{Ir}_{2}\mathrm{O}_{7}}$ system using ${\mu}$SR and DC susceptibility. Our results show that pure ${\mathrm{Y}_{2}\mathrm{Ir}_{2}\mathrm{O}_{7}}$ has a magnetic transition to long-range order. Substituting the Bi by Y results in a lower temperature transition with a less homogeneous spin-glass like order with increasing {\it x}. We will show the resulting magnetic phase diagram for this system to understand how its magnetic properties behave near the metal insulator phase boundary.

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Authors

  • T. Medina

    • Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada
    • McMaster University

  • T.J. Williams

    • McMaster University and Oak Ridge National Laboratory

  • T.J. Munsie

    • Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada
    • Department of Physics and Astronomy, McMaster University
    • McMaster University

  • R.M. D'Ortenzio

    • McMaster University

  • L. Liu

    • Columbia University

  • B.J. Frandsen

    • Columbia University

  • Y.J. Uemura

    • Columbia University

  • M.C. Shapiro

    • Stanford University

  • S.C. Riggs

    • Stanford University

  • M.B. Stone

    • Oak Ridge National Laboratory

  • I.R. Fisher

    • Stanford University

  • C. Thompson

    • McMaster University

  • C. Marjerrison

    • McMaster University

  • H.A. Dabkowska

    • Brockhouse Institute for Materials Research

  • Graeme Luke

    • Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada
    • McMaster University