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

B. G. Ueland; N. H. Jo; A. Sapkota; W. Tian; M. Masters; H. Hodovanets; S. S. Downing; C. Schmidt; R. J. McQueeney; S. L. Bud'Ko; A. Kreyssig; P. C. Canfield; A. I. Goldman

doi:10.1103/PhysRevB.97.165121

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

B. G. Ueland, N. H. Jo, A. Sapkota, W. Tian, M. Masters, H. Hodovanets, S. S. Downing, C. Schmidt, R. J. McQueeney, S. L. Bud'Ko, A. Kreyssig, P. C. Canfield, A. I. Goldman

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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 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.

Original language	English
Article number	165121
Journal	Physical Review B
Volume	97
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.97.165121
State	Published - Apr 13 2018

Funding

We appreciate assistance from L. J. Santodonato while using the CG-1 B utility diffractometer at HFIR to initially align the samples, and the Sample Environment Group at HFIR. Work at the Ames Laboratory was supported by the Department of Energy, Basic Energy Sciences, Division of Materials Sciences & Engineering, under Contract No. DE-AC02-07CH11358. N.H.J. is supported by the Gordon and Betty Moore Foundation EPiQS Initiative (Grant No. GBMF 4411). A portion of this research used resources at the High Flux Isotope Reactor, a U.S. DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
U.S. Department of Energy	DE-AC02-07CH11358
Gordon and Betty Moore Foundation	GBMF 4411
Basic Energy Sciences
Division of Materials Sciences and Engineering

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10.1103/PhysRevB.97.165121

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Ueland, B. G., Jo, N. H., Sapkota, A., Tian, W., Masters, M., Hodovanets, H., Downing, S. S., Schmidt, C., McQueeney, R. J., Bud'Ko, S. L., Kreyssig, A., Canfield, P. C., & Goldman, A. I. (2018). Reduction of the ordered magnetic moment and its relationship to Kondo coherence in Ce1-xLaxCu₂Ge₂. Physical Review B, 97(16), Article 165121. https://doi.org/10.1103/PhysRevB.97.165121

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

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 N{\'e}el 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.",

author = "Ueland, {B. G.} and Jo, {N. H.} and A. Sapkota and W. Tian and M. Masters and H. Hodovanets and Downing, {S. S.} and C. Schmidt and McQueeney, {R. J.} and Bud'Ko, {S. L.} and A. Kreyssig and Canfield, {P. C.} and Goldman, {A. I.}",

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doi = "10.1103/PhysRevB.97.165121",

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AU - Ueland, B. G.

AU - Jo, N. H.

AU - Sapkota, A.

AU - Tian, W.

AU - Masters, M.

AU - Hodovanets, H.

AU - Downing, S. S.

AU - Schmidt, C.

AU - McQueeney, R. J.

AU - Bud'Ko, S. L.

AU - Kreyssig, A.

AU - Canfield, P. C.

AU - Goldman, A. I.

PY - 2018/4/13

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N2 - 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.

AB - 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.

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

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