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Dresden 2003 – scientific programme

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TT: Tiefe Temperaturen

TT 6: Postersitzung I (Amorphe- u. Tunnelsysteme, Niedrigdimensionale Systeme, Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter)

TT 6.31: Poster

Monday, March 24, 2003, 14:30–19:00, P2c, P2d

Determination of oxygen content of ceramic cuprate superconductors — •Lars Lasogga1, Alica Krapf1, Matthias Schneider1, Roland Bartmann1, Recardo Manzke1, Irmina Kris Murwani2, and Erhard Kemnitz21Humboldt-University of Berlin, Department of Physics, Invalidenstraße 110, 10115 Berlin — 2Humboldt-University of Berlin, Department of Chemistry, Brook-Taylor-Straße 2, 12489 Berlin

According to our actual knowledge the superconductivy of the cuprates is due to electronic exitations of the copper-oxygen-states. For all investigations it is therefore very important to know the oxygen of the samples. On the other hand, it is well known that the determination of the oxygen content is not an easy experimental problem, because e.g. methods like EDX are too uncertain. Here we summerize our investigations obtained of Bi2−yPbyCan−1Sr2−xLaxCunO2n+4+δ by the iodometric titration method. In particular, changes due to a temper process in vacuum will be discussed for Bi2−yPbySr2−xLaxCuO6+δ. These experiments will be extended also for single crystals.

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