Unusual Charge Density Wave coupled to a metal-to-metal transition in Ce3Co4Sn13

We study the electronic structure of the skutterudite Ce₃Co₄Sn₁₃, which exhibits a charge density wave transition (CDW ; T_CDW∼160 K) coupled to a metal-to-metal transition. We use temperature dependent HAXPES and XAS to investigate the occupied and unoccupied electronic states of Ce₃Co₄Sn₁₃. The Co 2p and Sn 3p core level spectra show small but finite shifts in energy positions across T_CDW but Ce 3d core level spectra do not show any change across the transition. The Ce M-edge XAS spectrum compared with calculations indicate a typical trivalent ionic Ce³⁺ spectral shape, ruling out Kondo screening in Ce₃Co₄Sn₁₃. In contrast, the Co 2p L-edge XAS spectrum compared with calculations shows evidence for hybridization with neighbouring Sn atoms in a trigonal prismatic co-ordination. Temperature dependent XAS across the Co 2p L-edge shows a small shift across T_CDW, consistent with HAXPES results. The Co 3d states are observed at a binding energy of ∼2 eV while the Ce 4f states occurs within 0.5 eV of the Fermi level as a weak feature. The results indicate an unusual CDW coupled to a metal-to-metal transition in Ce₃Co₄Sn₁₃.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.T60.139

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Bulletin of the American Physical Society

APS March Meeting 2018

Volume 63, Number 1

Monday–Friday, March 5–9, 2018; Los Angeles, California

Session T60: Poster Session III

Abstract: T60.00139 : Unusual Charge Density Wave coupled to a metal-to-metal transition in Ce3Co4Sn13

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Abstract: T60.00139 : Unusual Charge Density Wave coupled to a metal-to-metal transition in Ce₃Co₄Sn₁₃