Anomalous magnetic behaviour of the mixed b-site pyrochlore Dy<sub>2</sub>ScNbO<sub>7</sub>

ORAL

Abstract

The spin ice state, a magnetic ground state exhibiting Pauling entropy analogous to water ice, has been well characterized in the rare-earth pyrochlores Dy2Ti2O7, and Dy2Sn2O7. To explore the response of the spin ice state to non-magnetic perturbation in dysprosium based pyrochlores, we present here a new species Dy2ScNbO7, which we have synthesized as both powder and single crystal. Our physical characterization has shown unexpected behaviour arising from the disordered b-site, with increased spin dynamics and an anomalously low spin-freezing temperature. We performed heat capacity measurements with an applied magnetic field along the [111] direction, notable in pyrochlores for its alternating Kagomé-Triangular layers, and the [110] direction, a bond direction between magnetic species. The phase diagrams we have constructed from these measurements and other recent physical characterization results show a divergence from spin ice behaviour but recent neutron scattering data lead us to believe that the novel physics in our system is not entirely due to the disordered B-site. We will present these results to this meeting for discussion.

*I would like to thank the following funding agencies:

NSERC
Canadian Foundation for Innovation
CIFAR
Canadian Research Chairs

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Presenters

  • Megan Rutherford

    • McMaster Univ

Authors

  • Megan Rutherford

    • McMaster Univ

  • Cole D Mauws

    • Dept. of Chemistry, University of Manitoba
    • Chemistry, University of Manitoba
    • University of Manitoba

  • Adam Aczel

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oakridge National Lab

  • James W Beare

    • McMaster Univ
    • Department of Physics & Astronomy, McMaster University
    • McMaster University

  • Graeme Luke

    • McMaster Univ
    • Physics and Astronomy, McMaster University
    • Department of Physics & Astronomy, McMaster University
    • McMaster University

  • Casey Marjerrison

    • Department of Physics, Duke University
    • McMaster Univ
    • Duke University

  • Sara Haravifard

    • Department of Physics and Department of Mechanical Engineering & Materials Science, Duke University
    • Department of Physics and Department of Mechanical Engineering & Materials Science, Duke University, North Carolina, USA
    • Department of Physics, Department of Mechanical Engineering & Materials Science, Duke University
    • Duke University

  • Haidong Zhou

    • University of Tennessee
    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • University of Knoxville, Tennessee
    • Department of Physics & Astronomy, University of Tennessee
    • University of Tennesse, Knoxville
    • Physics and anstronomy, University of Tennessee
    • Department of Physics, University of Tennessee
    • Physics, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville

  • Christopher Wiebe

    • Univ of Edinburgh
    • The University of Winnipeg
    • University of Winnipeg