Transition from a mixed-valent system to a magnetically ordered Kondo lattice in Ce(NiSi)2-x(CuGe)x

G. Liang, Robert Barber, Yijie Tang, Mark Croft, J. L. Cobb, J. T. Markert

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9 Citations (Scopus)

Abstract

The crossover from mixed-valent to magnetically ordered Kondo or heavy-fermion behavior in Ce(NiSi)2-x(CuGe)x has been studied. Results of Ce L3-edge, structural, magnetic, and transport measurements are presented. It is suggested that the abnormal increase of the lattice parameter c in the region 1.6x2.0 be irrelevant to the Ce 4f-ligand orbital dehybridizations and the associated heavy-fermion state. Our results show that the substitution for Cu (and Ge) for Ni (and Si) drives this series from a strong mixed-valent to an antiferromagnetically ordered trivalent Kondo-lattice system. Particularly, it is found that the physical properties of the x=1.4 compound are very similar to that of the heavy-fermion superconductor CeCu2Si2. The resistivity data also indicate that there is an active interplay between the crystalline electric field, coherence effects, and Kondo scattering. Moreover, this study supports the proposal that the Kondo-type spin fluctuation can be effectively quenched by the internal 3d-host magnetic field in some CeMn2Si2-based materials. Magnetic susceptibility data show that this compound series is antiferromagnetically ordered for x>1.6 and the spin-fluctuation temperature Tsf decreases with increasing x in this region. A phase diagram is proposed to illustrate the evolution of the series from a single-impurity Kondo to a coherent Kondo and then to an antiferromagnetically ordered system.

Original languageEnglish (US)
Pages (from-to)214-222
Number of pages9
JournalPhysical Review B
Volume51
Issue number1
DOIs
StatePublished - Jan 1 1995

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Spin fluctuations
Fermions
Heavy fermion superconductors
fermions
Magnetic susceptibility
Lattice constants
Phase diagrams
heavy fermion superconductors
Substitution reactions
Physical properties
Ligands
Electric fields
Scattering
Impurities
Magnetic fields
Crystalline materials
magnetic measurement
proposals
lattice parameters
crossovers

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Liang, G. ; Barber, Robert ; Tang, Yijie ; Croft, Mark ; Cobb, J. L. ; Markert, J. T. / Transition from a mixed-valent system to a magnetically ordered Kondo lattice in Ce(NiSi)2-x(CuGe)x. In: Physical Review B. 1995 ; Vol. 51, No. 1. pp. 214-222.
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Transition from a mixed-valent system to a magnetically ordered Kondo lattice in Ce(NiSi)2-x(CuGe)x. / Liang, G.; Barber, Robert; Tang, Yijie; Croft, Mark; Cobb, J. L.; Markert, J. T.

In: Physical Review B, Vol. 51, No. 1, 01.01.1995, p. 214-222.

Research output: Contribution to journalArticle

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