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

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.

doi:10.1103/PhysRevB.97.165121

Reduction of the ordered magnetic moment and its relationship to Kondo coherence in Ce_1-xLa_xCu₂Ge₂

Journal Article · Fri Apr 13 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.165121· OSTI ID:1435749

Ueland, B. G. ^[1]; Jo, N. H. ^[1]; Sapkota, A. ^[1]; ^[2]; Masters, Morgan W. ^[1]; Hodovanets, H. ^[3]; Downing, S. S. ^[1]; Schmidt, C. ^[1]; McQueeney, R. J. ^[1]; Bud'ko, Sergey L. ^[1]; Kreyssig, A. ^[1]; Canfield, Paul C. ^[1]; Goldman, A. I. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of Maryland, College Park, MD (United States)

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 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_xCu₂Ge₂ provides an exceptional opportunity to quantitatively study the multiple magnetic interactions in a Kondo lattice.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1435749

Alternate ID(s):: OSTI ID: 1433030
OSTI ID: 1468097

Report Number(s):: IS-J--9652

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 16 Vol. 97; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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