Absence of moment fragmentation in the mixed B site pyrochlore oxide Nd<sub>2</sub>GaSbO<sub>7</sub>

POSTER

Abstract

Nd-based pyrochlore compounds (Nd2B2O7) are of particular interest in the framework of moment fragmentation physics. Introduction of charge disorder on a non-magnetic B site in these systems is expected to reduce the symmetry about the Nd site, significantly suppressing moment fragmentation. Here we report on a polycrystalline sample of a Nd pyrochlore with a charge-disordered B-site, Nd2GaSbO7. We show that this compound orders into the “all-in, all-out” magnetic structure below TN = 1 K, one of the highest ordering temperatures reported for a Nd pyrochlore. The Ising-like character of the moments and the dipolar-octupolar nature of the ground state doublet are confirmed via bulk property measurements and crystal field analysis, respectively, both of which are necessary for moment fragmentation. Although inelastic neutron scattering results show a flat mode at 0.253(6) meV, the diffuse neutron scattering was not able to resolve any spin-ice correlations. These results may suggest the absence of moment fragmentation in this system.

*This material is based upon work supported by ERC, CCSF, EPSRC, the University of Edinburgh PCDS and GRS, the Carnegie Trust for the Universities of Scotland, UC LEADS, and the NSF Graduate Research Fellowship under Grant No. 1650114.

Presenters

  • Benito Gonzalez

    • Materials Department, University of California, Santa Barbara, California 93106-5050, USA

Authors

  • Benito Gonzalez

    • Materials Department, University of California, Santa Barbara, California 93106-5050, USA

  • Steven Gomez

    • Materials Department, University of California, Santa Barbara, California 93106-5050, USA

  • Paul M. Sarte

    • California NanoSystems Institute, University of California, Santa Barbara, California 93106-6105, USA

  • Micaela Zelensky

    • Department of Chemistry, University of Winnipeg, Winnipeg, MB, R3B 2E9, Canada

  • Alannah M. Hallas

    • University of British Columbia
    • Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada

  • Edward Pace

    • Univ of Edinburgh
    • Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom

  • Stuart Calder

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • Matthew Brandon Stone

    • Oak Ridge National Lab
    • Oak Ridge national lab
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Oakridge National Laboratory

  • Yixi Su

    • Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748 Garching, Germany

  • Erxi Feng

    • Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748 Garching, Germany

  • Duc Le

    • ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom

  • Paul Attfield

    • Univ of Edinburgh
    • Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom

  • Stephen D. Wilson

    • Materials Department, UC Santa Barbara
    • Materials Department, University of California, Santa Barbara, California 93106-5050, USA
    • Materials, University of Santa Barbara
    • Materials Department, University of California, Santa Barbara

  • Adam Aczel

    • Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Christopher Wiebe

    • Department of Chemistry, University of Winnipeg, Winnipeg, MB, R3B 2E9, Canada