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

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

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.

Authors:

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)

Publication Date:: Fri Apr 13 00:00:00 EDT 2018

Research Org.:: Ames Lab., 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)

OSTI Identifier:: 1435749

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

Report Number(s):: IS-J-9652
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1900101

Grant/Contract Number:: AC02-07CH11358; DGE1247194; AC05-00OR22725

Resource 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)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    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., 2018. 
Web.  doi:10.1103/PhysRevB.97.165121.

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                    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.  https://doi.org/10.1103/PhysRevB.97.165121

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                    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. Fri .  
"Reduction of the ordered magnetic moment and its relationship to Kondo coherence in Ce1-xLaxCu2Ge2".  United States.  https://doi.org/10.1103/PhysRevB.97.165121.  https://www.osti.gov/servlets/purl/1435749.

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@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 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.},

  doi          = {10.1103/PhysRevB.97.165121},

  journal      = {Physical Review B},

  number       = 16,

  volume       = 97,

  place        = {United States},

  year         = {Fri Apr 13 00:00:00 EDT 2018},

  month        = {Fri Apr 13 00:00:00 EDT 2018}

}

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journal, October 2012

Kurzawski, Łukasz; Malarz, Krzysztof
Reports on Mathematical Physics, Vol. 70, Issue 2
DOI: 10.1016/S0034-4877(12)60036-6

Magnetic order in a Kondo lattice: A neutron scattering study of CeCu2Ge2
journal, February 1989

Knopp, G.; Loidl, A.; Knorr, K.
Zeitschrift f�r Physik B Condensed Matter, Vol. 77, Issue 1
DOI: 10.1007/BF01313625

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Magnetic properties of isostructural substitutional solid solutions Ce/sub x/La/sub 1-x/Cu/sub 2/Si/sub 2/ (0< or =1) have been studied in the temperature interval 0.06< or =T< or =2.5 K. A cusp has been found in the temperature dependence of the magnetic susceptibility at T = T/sub SG/, which is related to the transition of Ce/sub x/La/sub 1-x/Cu/sub 2/Si/sub 2/ into a spin glass. It has been found that temperature T/sub SG/ initially (0.2< or =x< or =0.6) increases from 0.3 K to 1.6 K, and then in the region x> or approx. =0.8, the value of T/sub SG/ decreases, and nearmore »« less
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The CeIn/sub 3/ system is a dense Kondo system which crystallizes in a Cu/sub 3/Au face-centered cubic structure. This trivalent compound is known to be a simple type II antiferromagnet with a T/sub N/ of 10K and displays characteristic Kondo behavior. The effect of diluting CeIn/sub 3/ with nonmagnetic substitutional impurities on the Ce site of the cubic fcc structure was studied to deduce the effects of chemical pressure and changes in the electron per atom ratio. These studies have focused on both independent ion and cooperative effects. Of primary interest is the variation of the Neel temperature, the crystalmore »« less
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The systems Ce(Cu/sub 1-x/Me/sub x/)/sub 2/Si/sub 2/)(Me = Au, Ni), were investigated using probes including magnetic susceptibility, electrical resistivity and L/sub 111/ absorption edge spectra. The primary interest of these studies was in phenomena that result form 4f instabilities in Kondo lattice systems. Of particular interest was the study of the interplay of crystalline electric field (CEF) effects and Kondo fluctuations and the investigation of scaling phenomena associated with the 4f instability. CeCu/sub 2/Si/sub 2/ is an interesting Kondo lattice system. It has a non-integral valence and a superconducting ground state with a T/sub c/ of 0.5 K. The effectivemore »« less
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Lattice, Ce-L{sub 3} edge, resistivity, and magnetic susceptibility measurements have been carried out on the polycrystalline Ce{sub 1{minus}x}La{sub x}Mn{sub 2}Si{sub 2} system (0{le}x{le}1) to study the interplay between Mn 3d-host magnetism and Kondo-type Ce-spin fluctuations. As x increases, the system varies gradually from a Ce mixed-valent system with 3d-host antiferromagnetism (at x=0) to a nearly trivalent system with strong 3d-host ferromagnetism (near x=1). In the antiferromagnetic (AF) phase region (0{le}x{le}0.5), the Neel temperature T{sub N} decreases with the increase of x, manifesting the weakening of the host AF field. Impurity Kondo behavior is observed at x=0.05, indicating that the low-temperaturemore »« less
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We have measured the electric resistivity, magnetoresistance, magnetic susceptibility and magnetization of the new Kondo-lattice compound Ce₃Pd₄Ge₄. The electrical resistivity exhibits a rapid drop at temperatures below 6 K, while the magnetic susceptibility does not show any corresponding anomaly at that temperature. This phenomenon is similar to that of Ce₃Pd₂₀Ge₆ which shows quadrupolar interaction. We suggest that there is the possibility of quadrupolar interaction in the orthorhombic 4f-electron system Ce₃Pd₄Ge₄. In addition, it is realized that the spin-dependent scattering effect is responsible for the magnetotransport.
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Abstract

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