Fragile antiferromagnetic order in the heavy-fermion YbBiPt

ORAL

Abstract

YbBiPt is a heavy-fermion compound ($\gamma\approx$ 8 J/molK$^2$) possessing antiferromagnetic order below a N\'{e}el temperature of $T_{\rm{N}}$= 0.4 K, and a proposed quantum critical point at a magnetic field of $H_{\rm{c}}\approx$ 0.4 T. We report results from neutron scattering experiments on single crystals which characterize the antiferromagnetic order. The magnetic scattering is described in terms of two components: a narrow component that appears below $T_{\rm{N}}$ which corresponds to the onset of antiferromagnetic order observed in bulk thermodynamic and transport measurements, and a broad component corresponding to antiferromagnetic correlations extending over $\approx$ 20 $\rm{\AA}$ that persists up to $T^{\rm{*}}\approx$ 0.7 K. These results illustrate the unconventional nature of the magnetism in YbBiPt and may be a consequence of its competing low-energy magnetic interactions and proximity to a quantum critical point.\\ Work at the Ames Laboratory was supported by the Department of Energy, Basic Energy Sciences under Contract No. DE-AC02-07CH11358.

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Authors

  • B.G. Ueland

    • Ames Laboratory and Iowa State University
    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University

  • A. Kreyssig

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University

  • K. Proke\v{s}

    • Helmholtz-Zentrum Berlin f{\"{u}}r Materialien und Energie

  • J.W. Lynn

    • NIST Center for Neutron Research, National Institute of Standards and Technology

  • L.W. Harriger

    • NIST Center for Neutron Research, National Institute of Standards and Technology

  • D.K. Pratt

    • NIST Center for Neutron Research, National Institute of Standards and Technology

  • D.K. Singh

    • NIST Center for Neutron Research, National Institute of Standards and Technology

  • T.W. Heitmann

    • The Missouri Research Reactor, University of Missouri

  • S. Sauerbrei

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University

  • S.M. Saunders

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University

  • E.D. Mun

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University

  • S.L. Bud'ko

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University

  • R.J. McQueeney

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University

  • P.C. Canfield

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University

  • A.I. Goldman

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University