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Title: Reduction of the ordered magnetic moment and its relationship to Kondo coherence in Ce 1-xLa xCu 2Ge 2

The microscopic details of the suppression of antiferromagnetic order in the Kondo-lattice series Ce 1-xLa xCu 2Ge 2 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, T N, 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. Here, we discuss our results in terms of local-moment- versus itinerant-type magnetism and mean-field theory, and show that Ce 1-xLa xCu 2Ge 2 provides an exceptional opportunity to quantitatively study the multiple magnetic interactions in a Kondo lattice.
Authors:
 [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [1] ;  [3] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of Maryland, College Park, MD (United States)
Publication Date:
Report Number(s):
IS-J-9652
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1900101
Grant/Contract Number:
AC02-07CH11358; DGE1247194; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1435749
Alternate Identifier(s):
OSTI ID: 1433030; OSTI ID: 1468097

Ueland, B. G., Jo, N. H., Sapkota, A., Tian, Wei, Masters, Morgan W., Hodovanets, H., Downing, S. S., Schmidt, C., McQueeney, R. J., Bud'ko, Sergey L., Kreyssig, A., Canfield, Paul C., and Goldman, A. I.. Reduction of the ordered magnetic moment and its relationship to Kondo coherence in Ce1-xLaxCu2Ge2. United States: N. p., Web. doi:10.1103/PhysRevB.97.165121.
Ueland, B. G., Jo, N. H., Sapkota, A., Tian, Wei, Masters, Morgan W., Hodovanets, H., Downing, S. S., Schmidt, C., McQueeney, R. J., Bud'ko, Sergey L., Kreyssig, A., Canfield, Paul C., & Goldman, A. I.. Reduction of the ordered magnetic moment and its relationship to Kondo coherence in Ce1-xLaxCu2Ge2. United States. doi:10.1103/PhysRevB.97.165121.
Ueland, B. G., Jo, N. H., Sapkota, A., Tian, Wei, Masters, Morgan W., Hodovanets, H., Downing, S. S., Schmidt, C., McQueeney, R. J., Bud'ko, Sergey L., Kreyssig, A., Canfield, Paul C., and Goldman, A. I.. 2018. "Reduction of the ordered magnetic moment and its relationship to Kondo coherence in Ce1-xLaxCu2Ge2". United States. doi:10.1103/PhysRevB.97.165121. https://www.osti.gov/servlets/purl/1435749.
@article{osti_1435749,
title = {Reduction of the ordered magnetic moment and its relationship to Kondo coherence in Ce1-xLaxCu2Ge2},
author = {Ueland, B. G. and Jo, N. H. and Sapkota, A. and Tian, Wei and Masters, Morgan W. and Hodovanets, H. and Downing, S. S. and Schmidt, C. and McQueeney, R. J. and Bud'ko, Sergey L. and Kreyssig, A. and Canfield, Paul C. and Goldman, A. I.},
abstractNote = {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. Here, 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.},
doi = {10.1103/PhysRevB.97.165121},
journal = {Physical Review B},
number = 16,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}

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