Regensburg 2000 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 24: Massive HTSL, YBCO/BSCCO Bandleiter

TT 24.10: Vortrag

Freitag, 31. März 2000, 13:00–13:15, H20

Low-temperature scanning laser microscopy of individual filaments extracted from (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+x tapes — •D. Abraimov^1,2, A. G. Sivakov², A. V. Lukashenko², M. Leghissa³, M. V. Fistul¹, P. Müller¹, and A. V. Ustinov¹ — ¹Physikalisches Institut III, Universität Erlangen-Nürnberg, Erwin-Rommel-Straße 1, D-91058 Erlangen — ²B.I. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine — ³Siemens Corporate Technology, Erlangen, Postfach 3220, D-91050 Erlangen, Germany

We present an experimental and theoretical study of transport properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+x filaments by means of low-temperature scanning laser microscopy (LTSLM). The method of LTSLM allows to visualize the local inhomogeneities individual superconducting filaments extracted from (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+x/Ag tapes. Using the non-bolometric response, a spatial resolution of about 1 µm is demonstrated for 10 µm thick filaments. We verified a procedure to image both the distribution of the critical currents and critical temperatures over a sample. Some of the grain boundaries between crystallites show Josephson behavior. Using autocorrelation analysis of the voltage response, characteristic lengths of the critical current inhomogeneity can be retrieved for filaments extracted from different parts of the tape.