Formation of a Simple Cubic Antiferromagnet Through Charge Ordering

ORAL

Abstract

EuPd3S4 is a mixed-valent lattice in which the BCC Eu2+ and Eu3+ ions occur in about a 1:1 ratio. The magnetic order below TN=2.9 K, however, has not been directly probed. Here we report what are to our knowledge the first neutron diffraction results on EuPd3S4 single-crystals, as well as comprehensive heat capacity measurements revealing the magnetic phase diagram. In addition to identifying k=(1/2,1/2,1/2) antiferromagnetic order, we find forbidden nuclear reflections in the field-polarized paramagnetic state. Our results resolve a longstanding question regarding charge ordering in EuPd3S4, showing the glide symmetries connecting Eu 2a sites are in-fact broken and the space group is of lower symmetry than previously understood.

*Work done at Johns Hopkins University was supported by the Institute for Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0019331. Work done at Ames Laboratory was supported by the U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering. Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358.

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Presenters

  • Vincent C Morano

    • Johns Hopkins University

Authors

  • Vincent C Morano

    • Johns Hopkins University

  • Tanya Berry

    • Princeton University

  • Thomas J Halloran

    • Johns Hopkins University

  • Jason Zhang

    • Johns Hopkins University

  • Aashish Sapkota

    • Ames National Laboratory
    • Ames National Laboratory/Iowa State University

  • Weiwei Xie

    • Rutgers, The State University of New Jersey

  • Zhijun Xu

    • University of Maryland, College Park

  • Yang Zhao

    • University of Maryland, College Park

  • Jeffrey W Lynn

    • National Institute of Standards and Tech

  • Tom Fennell

    • Paul Scherrer Institut, Switzerland
    • Paul Scherrer Institut

  • Paul C Canfield

    • Iowa State University
    • Ames National Laboratory
    • Ames National Laboratory/Iowa State University

  • Tyrel M McQueen

    • Johns Hopkins University
    • Cornell University
    • Department of Chemistry, Johns Hopkins University

  • Collin L Broholm

    • John Hopkins University
    • Johns Hopkins University