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- W2094498045 abstract "The effect of doping silicon clathrate structures with sodium atoms has been investigated experimentally by x-ray photoemission and x-ray absorption spectroscopies. Both techniques reveal a poor screening of the sodium atoms inside the silicon cages. We also discuss the sodium state that is intermediate between the metal-like and the atomlike ones. These results are in agreement with theoretical predictions of Demkov et al. and Smelyansky and Tse. In addition, the fine analysis of the extended x-ray absorption fine structure region reveals unambiguously a large displacement $(0.9ifmmodepmelsetextpmfi{}0.2$ AA{}) of the sodium atom with respect to the center of the silicon cage. This displacement is higher than the one predicted by a simple Jahn-Teller effect and is discussed in terms of sodium pairing. The formation of dimers with covalent bonding is compared to the Peierls distortion in a monodimensional network." @default.
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- W2094498045 date "2000-06-15" @default.
- W2094498045 modified "2023-10-16" @default.
- W2094498045 title "Peierls or Jahn-Teller effect in endohedrally doped silicon clathrates: An EXAFS study" @default.
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- W2094498045 doi "https://doi.org/10.1103/physrevb.61.16550" @default.
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