Reduction of the Ordered Magnetic Moment and its Relationship to Kondo Coherence in Ce₁₋ₓLaₓCu₂Ge₂

Author

B. G. Ueland
N. H. Jo
A. Sapkota
W. Tian
M. Masters
Halyna Hodovanets, Missouri University of Science and TechnologyFollow
S. S. Downing
C. Schmidt
R. J. McQueeney
For full list of authors, see publisher's website.

Abstract

The microscopic details of the suppression of antiferromagnetic order in the Kondo-lattice series Ce_1-xLa_xCu₂Ge₂ 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 Ce_1-xLa_xCu₂Ge₂ provides an exceptional opportunity to quantitatively study the multiple magnetic interactions in a Kondo lattice.

Recommended Citation

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

Department(s)

Physics

Comments

U.S. Department of Energy, Grant DE-AC02-07CH11358

International Standard Serial Number (ISSN)

2469-9969; 2469-9950

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2018 American Physical Society (APS), All rights reserved.

Publication Date

13 Apr 2018