Reduction of the Ordered Magnetic Moment and its Relationship to Kondo Coherence in Ce₁₋ₓLaₓCu₂Ge₂
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 Néel 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 the multiple magnetic interactions in a Kondo lattice.
B. G. Ueland and N. H. Jo and A. Sapkota and W. Tian and M. Masters and H. Hodovanets and S. S. Downing and C. Schmidt and R. J. McQueeney and For full list of authors, see publisher's website., "Reduction of the Ordered Magnetic Moment and its Relationship to Kondo Coherence in Ce₁₋ₓLaₓCu₂Ge₂," Physical Review B, vol. 97, no. 16, article no. 165121, American Physical Society (APS), Apr 2018.
The definitive version is available at https://doi.org/10.1103/PhysRevB.97.165121
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© 2018 American Physical Society (APS), All rights reserved.
13 Apr 2018
U.S. Department of Energy, Grant DE-AC02-07CH11358