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Anomalous magnetic properties and non-Fermi-liquid behaviour in single crystals of the Kondo lattice CeNiGe2-xSix

Title
Anomalous magnetic properties and non-Fermi-liquid behaviour in single crystals of the Kondo lattice CeNiGe2-xSix
Authors
Kim, D. Y.Ryu, D. H.Hong, J. B.Park, J. G.Kwon, Yong SeungJung, M. A.Jung, M. H.Takeda, N.Ishikawa, M.Kimura, S.
DGIST Authors
Kwon, Yong Seung
Issue Date
2004-11
Citation
Journal of Physics Condensed Matter, 16(46), 8323-8334
Type
Article
Article Type
Article
Keywords
Electric conductivityFermi liquidsFermionsMagnetic momentsMagnetic susceptibilityMagnetismMagnetizationPhase transitionsQuantum theorySingle crystalsSpecific heatAntiferromagnetic orderConduction electronsTemperature dependenceCerium compounds
ISSN
0953-8984
Abstract
We report on the magnetic susceptibility, specific heat and electrical resistivity of the heavy fermion compounds CeNiGe2-xSix (0 ≤ x ≤ 1). Compounds with x < 1 show antiferromagnetic order, which with increasing x shifts toward lower temperature owing to increased exchange coupling between the localized 4f magnetic moments and conduction electrons. Eventually, the magnetic order almost becomes absent, for x = 1. An anomaly observed in the specific heat is well interpreted by the Kondo model for a degenerate impurity spin J = 1/2 in the Coqblin-Schrieffer limit. A coherence peak indicative of the formation of a Kondo lattice is found in the electrical resistivity, whose features are consistent with the results for the specific heat. Interestingly, there is a significant deviation from Fermi-liquid behaviour at the critical concentration x = 1. This deviation is attributed to a quantum phase transition in a model with two-dimensional antiferromagnetic fluctuations.
URI
http://hdl.handle.net/20.500.11750/5842
DOI
10.1088/0953-8984/16/46/018
Publisher
IOP PUBLISHING LTD
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
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Collection:
Department of Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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