Reduction of the ordered-magnetic moment and its relationship to Kondo coherence in Ce<sub>1-<i>x</i></sub>La<i><sub>x</sub></i>Cu<sub>2</sub>Ge<sub>2</sub>
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
arXiv:1710.08329
*Work at the Ames Laboratory was supported by the Department of Energy, Basic Energy Sciences under Contract No. DE-AC02-07CH11358. This research is funded in part by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4411. A portion of this research used resources at the High Flux
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Presenters
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Benjamin Ueland
- Ames Laboratory, Iowa State University
- Dept. of Physics and Astronomy, Ames Laboratory/Iowa State University