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A Heavy Fermion Zn-Deficient CaBe2Ge2-Type Phase with Rare Ce-Based Ferromagnetism and Large Magnetoresistance

Published inChemistry of materials, vol. 34, no. 5, p. 2352-2360
Publication date2022-02-25
First online date2022-02-25
Abstract

We report on the hitherto unknown compound CeZn2−δGe2 (δ ≈ 0.41). We find that this compound crystallizes in a defect version of the well-known CaBe2Ge2 structure type. The phase forms in a Zn/In flux and with Zn deficiency on one of its crystallographic sites. We find that the compound displays uncommon localized Ce-based (4f1) ferromagnetism with a Tc of 6.6 K, a large positive magnetoresistance reaching an MR of approximately 32% below 10 K, and strongly correlated electrons, as evidenced by a Kadowaki-Woods ratio A2 close to those of known heavy fermion compounds. The here discovered material is therefore a promising model platform for the investigation of these entangled interacting and potentially competing electronic states paired with complex crystal chemistry.

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Citation (ISO format)
LEFÈVRE, Robin, VON ROHR, Fabian. A Heavy Fermion Zn-Deficient CaBe<sub>2</sub>Ge<sub>2</sub>-Type Phase with Rare Ce-Based Ferromagnetism and Large Magnetoresistance. In: Chemistry of materials, 2022, vol. 34, n° 5, p. 2352–2360. doi: 10.1021/acs.chemmater.1c04328
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ISSN of the journal0897-4756
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Creation07/11/2022 1:43:00 PM
First validation07/11/2022 1:43:00 PM
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