Valence instabilities in rare earth systems as revealed by photoemission
Identifieur interne : 004556 ( Main/Exploration ); précédent : 004555; suivant : 004557Valence instabilities in rare earth systems as revealed by photoemission
Auteurs : R. A. Pollak [États-Unis]Source :
- Journal of The Less-Common Metals [ 0022-5088 ] ; 1983.
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Abstract
Abstract: We used high resolution (δE < 150 meV) photoemission with synchrotron radiation in the range 10 eV < hv < 130 eV to study archetypal mixed valent and related cerium-, samarium-, europium-, thulium- and ytterbium-based systems. Generally all mixed valent systems (except the cerium-based system which is not yet fully characterized) exhibit an integer valent surface layer which has the lower value of the two bulk valence configurations. Temperature-dependent changes in bulk valence were observed in the europium and samarium compounds. Mixed valence was observed to persist down to at least 5 at.% dilution of thulium in TmxY1−xSe while thulium appears to remain trivalent in all TmxY1−xS compounds studied.
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DOI: 10.1016/0022-5088(83)90466-6
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