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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.

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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