ISSN:
1434-6036
Keywords:
PACS. 71.30.+h Metal insulator transitions and other electronic transitions - 61.10.Ht X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050575
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