Antiferromagnetic behavior in CeCo9Ge4

We investigate the novel intermetallic ternary compounds RCo9Ge4 with R La and Ce by means of X-ray diffraction, susceptibility and specific heat measurements. CeCo9Ge4 crystallizes in the space group I4/mcm and is characterized by the coexistence of two different magnetic sublattices. The Ce-based...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-01, Vol.200 (1), p.012049
Main Authors: Gold, C, Peyker, L, Scheidt, E-W, Michor, H, Scherer, W
Format: Article
Language:English
Subjects:
Antiferromagnetism
Cerium
Magnetic moments
Phase transitions
Physics
Specific heat
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Summary:We investigate the novel intermetallic ternary compounds RCo9Ge4 with R La and Ce by means of X-ray diffraction, susceptibility and specific heat measurements. CeCo9Ge4 crystallizes in the space group I4/mcm and is characterized by the coexistence of two different magnetic sublattices. The Ce-based sublattice, with an effective moment close to the expected value for a Ce3+-ion, exhibits a magnetically ordered ground state with TN 12.5K. The Co-based sublattice, however, exhibits magnetic moments due to itinerant 3d electrons. The magnetic specific heat contribution of the Ce-sublattice is discussed in terms of a resonance-level model implying the interplay between an antiferromagnetic phase transition and the Kondo-effect and an underlying Schottky-anomaly indicating a crystal field level scheme splitting into three twofold degenerated micro states (Δ1 69K, Δ2 133 K).
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/200/1/012049