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Itinerant spin fluctuations in antiferromagnetic heavy-fermion system U<sub>2</sub>Zn<sub>17</sub>

ORAL

Abstract

We report an inelastic neutron scattering investigation of the heavy-fermion system U2Zn17. Covering the energy range from 0.1 to 10meV, we document a continuum of magnetic scattering localized in reciprocal space around magnetic Bragg peaks. In particular, no coherent spin-wave excitation are apparent for T=0.3 K and E>0.1meV, despite long-range antiferromagnetic order for T<TN=9.7K with an ordered moment of μ=0.8μΒ/U. At elevated temperature well above TN, the spectrum remains mostly unchanged though broadened in reciprocal space. U2Zn17 thus represents a unique model system that has no regime of coherent spin waves as in a collinear insulating AFM. Our comprehensive neutron scattering data motivates a DFT+DMFT calculation to quantitatively address the strong correlation effect, which also gives rise to the large Sommerfeld coefficient γ~200mJ/(mole K2) in the ordered state.

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Presenters

  • Yishu Wang

    Johns Hopkins University

Authors

  • Yishu Wang

    Johns Hopkins University

  • Hyowon Park

    University of Illinois at Chicago, Department of Physics, University of Illinois at Chicago, University of Illinois, Chicago

  • Daniel Pajerowski

    Oak Ridge National Lab, Oak Ridge National Laboratory

  • Andrei Savici

    Oak Ridge National Laboratory, Oak Ridge National Lab

  • Jose A. Rodriguez-Rivera

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

  • Zachary Fisk

    University of California, Irvine, Department of Physics and Astronomy, University of California, Department of Physics and Astronomy, University of California Irvine

  • Collin Leslie Broholm

    Johns Hopkins University, Department of Physics and Astronomy and Institute for Quantum Matter, The Johns Hopkins University, Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA, Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Physics, The Johns Hopkins University