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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 Kemnitz² — ¹Humboldt-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 Bi_2−yPb_yCa_n−1Sr_2−xLa_xCu_nO_2n+4+δ by the iodometric titration method. In particular, changes due to a temper process in vacuum will be discussed for Bi_2−yPb_ySr_2−xLa_xCuO_6+δ. These experiments will be extended also for single crystals.