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Emission Mössbauer study of oxygen deficient [formula omitted]
Journal article   Peer reviewed

Emission Mössbauer study of oxygen deficient [formula omitted]

Z. Homonnay, E. Kuzmann, M. Gál, S. Nagy, A. Vértes, L. Pöppl, A. Nath and Gy Vankó
Physica. C, Superconductivity, v 209(1)
1993

Abstract

The variation of Mössbauer parameters as a function of oxygen content in PrBa 2 Cu 3( 57 Co) O 6+x has been studied and compared to the results of similar studies on YBa 2Cu 3( 57Co)O 6+x. It was found that the Mössbauer isomer shift of 57Co( 57Fe) dopant at Cu(1) site shows the same behaviour as for YBa 2 Cu 3( 57 Co) O 6+x except that all isomer shifts are significantly higher than those for YBa 2Cu 3( 57Co)O 6+x and several other superconducting 1-2-3 compounds. These findings are explained by the tendency of Pr III to form Pr IV, which can be responsible for the absence of superconductivity, and charge transfer between the Cu(2)-O sheets and Cu(1)-O chains. It is also concluded that at high oxygen stoichiometries the Cu(1)-O chains have metallic character for both compounds.

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Domestic collaboration
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Web of Science research areas
Physics, Applied
Physics, Condensed Matter
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