Unusual Charge Density Wave coupled to a metal-to-metal transition in Ce<sub>3</sub>Co<sub>4</sub>Sn<sub>13</sub>
POSTER
Abstract
We study the electronic structure of the skutterudite Ce3Co4Sn13, which exhibits a charge density wave transition (CDW ; TCDW∼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 TCDW 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 TCDW, 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.
Presenters
-
Amol Singh
- Natl Synchrotron Rad Res Ctr