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Anomalous magnetic properties and non-Fermi-liquid behaviour in single crystals of the Kondo lattice CeNiGe2-xSix
- Anomalous magnetic properties and non-Fermi-liquid behaviour in single crystals of the Kondo lattice CeNiGe2-xSix
- Kim, D. Y.; Ryu, D. H.; Hong, J. B.; Park, J. G.; Kwon, Yong Seung; Jung, M. A.; Jung, M. H.; Takeda, N.; Ishikawa, M.; Kimura, S.
- DGIST Authors
- Kwon, Yong Seung
- Issue Date
- Journal of Physics Condensed Matter, 16(46), 8323-8334
- Article Type
- Electric conductivity; Fermi liquids; Fermions; Magnetic moments; Magnetic susceptibility; Magnetism; Magnetization; Phase transitions; Quantum theory; Single crystals; Specific heat; Antiferromagnetic order; Conduction electrons; Temperature dependence; Cerium compounds
- 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.
- IOP PUBLISHING LTD
- Related Researcher
Kwon, Yong Seung
Quantum Functional Materials Laboratory
High Tc Superconductors and magnetic materials; Thermoelectric Materials
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- Department of Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles
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