X-ray spectroscopy of the metal-insulator transition in Yb Gd Te and Yb La Te

Autor:	Ouri Gorochov, D. Ravot, A. Percheron-Guégan, Alain Mauger, S. Merah, J.C. Dumas, J. Olivier-Fourcade
Rok vydání:	1998
Předmět:	X-ray spectroscopy Materials science Extended X-ray absorption fine structure Chemical bond Solid-state physics Debye–Waller factor Metal–insulator transition Condensed Matter Physics Molecular physics XANES Electronic Optical and Magnetic Materials Solid solution
Zdroj:	The European Physical Journal B. 6:487-496
ISSN:	1434-6028
DOI:	10.1007/s100510050575
Popis:	We report extended X-ray absorption fine structure (EXAFS) of Yb1-xGdxTe and Yb1-xLaxTe, two solid solutions which show an insulator-metal transition (IMT) as a function of x for a high donor concentration . The results are correlated to transport experiments and X-ray diffraction data, to analyse the IMT in relation to the structure at both a local and a macroscopic scale. A bimodal distribution is found for rare earth-Te nearest distances in these compounds crystallized in the fcc structure. In particular, we find the less rigid Yb-Te bond can be used as a local probe for the wavefunction of the electrons introduced by La or Gd donors, hence a new insight on the metal-insulator transitions which are of a different nature in the two solid solutions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e28401af7136074a58e256412c1def52 https://doi.org/10.1007/s100510050575 Zobrazit plný text záznamu Full text from SpringerLink