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TT: Tiefe Temperaturen

TT 7: Postersitzung I: Anwendungen der Supraleitung (1-6), Dünne Schichten, Josephsonkontakte, SQUIDs (7-17), Neue und unkonv. Supraleiter(18-23), Amorphe- und Tunnelsyst. (24-28), Quantenflüssigkeiten (29-30), Syst. korr. Elektr.: Theorie I (31-45)

TT 7.19: Poster

Montag, 11. März 2002, 14:30–18:00, A

Possible origin of d.c. magnetization anomalies in the superconducting state of RuSr₂GdCu₂O₈ — •Thomas P. Papageorgiou¹, Hans F. Braun¹, and Thomas Herrmannsdörfer² — ¹Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth — ²Forschungszentrum Rossendorf, 01314 Dresden

The d.c. magnetization of polycrystalline RuSr₂GdCu₂O₈ (Ru-1212) showed distinct peaks in the superconducting state of the sample. Sr₂GdRuO₆ (Sr-2116), the precursor for the preparation of Ru-1212, shows similar peaks in the same temperature regime. Nevertheless, based on measurements performed on powdered samples of Ru-1212 and Sr-2116, we exclude the possibility that the observed behavior of the magnetization of Ru-1212 is due to Sr-2116 impurities. We propose a qualitative model for the explanation of the origin of the Ru-1212 peaks, assuming the existence of regions with different superconducting transition temperatures in the sample, which accounts for much of the experimental data.