Reduction of the ordered-magnetic moment and its relationship to Kondo coherence in Ce1-xLaxCu2Ge2

ORAL

Abstract

The microscopic details of the suppression of antiferromagnetic order in the Kondo-lattice series Ce1-xLaxCu2Ge2 due to nonmagnetic dilution by La are revealed through neutron diffraction results for x=0.20, 0.40, 0.75, and 0.85. Magnetic Bragg peaks are found for 0.20≤x≤0.75, and both the Neel temperature, TN, and the ordered magnetic moment per Ce, µ, linearly decrease with increasing x. The reduction in µ points to strong hybridization of the increasingly diluted Ce 4f electrons, and we find a remarkable quadratic dependence of µ on the Kondo-coherence temperature. We discuss our results in terms of local-moment- versus itinerant-type magnetism and mean-field theory, and show that Ce1-xLaxCu2Ge2 provides an exceptional opportunity to quantitatively study competing magnetic interactions in a Kondo lattice.
arXiv:1710.08329

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Presenters

  • Benjamin Ueland

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

Authors

  • Benjamin Ueland

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

  • Na Hyun Jo

    Ames Laboratory and Iowa State University, Ames Laboratory, Iowa State University, Iowa state university/Ames Laboratory

  • Aashish Sapkota

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

  • Wei Tian

    Oak Ridge National Laboratory, Neutron Sciences Directorate, Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Lab

  • Morgan Masters

    Ames Laboratory, Iowa State University

  • Halyna Hodovanets

    Ames Laboratory, Iowa State University, CNAM, Department of Physics, University of Maryland, Univ of Maryland-College Park

  • Savannah Downing

    Ames Laboratory and Iowa State University, Ames Laboratory, Iowa State University, Iowa state university/Ames Laboratory

  • Conner Schmidt

    Ames Laboratory, Iowa State University

  • Robert McQueeney

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

  • Sergey Budko

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

  • Andreas Kreyssig

    Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames Laboratory/Iowa State University, Iowa State University, Ames Laboratory and Iowa State University, Dept. of Physics and Astronomy, Dept. of Physics, Iowa State Univ, Ames Lab

  • Paul Canfield

    Ames Laboratory and Iowa State University, Ames Laboratory, Iowa State University, Department of Physics and Astronomy, Iowa State University, Dept. of Physics and Astronomy, Ames Laboratory/Iowa State University, Iowa state university/Ames Laboratory, Ames Laboratory and Iowa State Univ, Iowa State University and Ames Laboratory, Iowa State University/Ames Laboratory, Iowa State University, Iowa State University / Ames Laboratory, Dept. of Physics, Iowa State Univ, Ames Lab, Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Iowa State Univ, Ames Laboratory, Department of Physics and Astronomy, Ames Laboratory and Iowa State University

  • Alan Goldman

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