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XANES study of rare-earth valency and 4f hybridization in Pb2Sr2Ln1−xCaxCu3O8 for Ln  Ce, Pr and Tb

✍ Scribed by K.R. Pedersen; J.-E. Jørgensen

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 436 KB
Volume: 264
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(96)00263-8

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✦ Synopsis

Pb2Sr2Ceo.sCao.sCu30 s and Pb2Sr2Lnl_xCaxCu308 with Ln =Pr, Tb and x= 0.0 and 0.5 have been studied by rare-earth L ILm edge XANES spectroscopy. The spectra of Pb 2 Sr2Ceo.sCao.sCu 308 show that Ca doping of Pb 2 Sr2CeCu 308 causes a partial oxidation of Ce. Analysis within the framework of the Anderson single-impurity model yields an f electron occupation of 0.5 in Pb2Sr2Ceo.sCao.sCu30 s. The partial oxidation of Ce in Pb2Sr2Ceo.sCao.sCu30 s prevents the formation of electron holes in the CuO 2 layers and thereby explains the lack of superconductivity in this compound. The XANES spectra of the Pr and Tb containing compounds show that the rare-earth ions in these compounds are trivalent and that no oxidation of the rare-earth ions is induced by Ca doping.

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