Münster 1999 – scientific programme
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TT: Tiefe Temperaturen
TT 9: Postersitzung I: TT-Teilchendetektoren (1-7), TT-Techniken (8-11), 2-D-Systeme (12-21), Meso- u. nanoskopische Strukturen (22-44), Niederdim. Spinsysteme (45-60), Tunneln u. Symmetrien (61-65), SQUID-Anwendungen (66-73), Massive HTSL, Bandleiter (74-96)
TT 9.82: Poster
Tuesday, March 23, 1999, 09:30–12:30, Z
Investigation of superconducting filaments from BSCCO/Ag tapes using low temperature scanning laser microscopy — •D.V. Abraimov1,2, A.G. Sivakov2, A.V. Lukashenko2, P. Müller1, and A.V. Ustinov1 — 1Physikalisches Institut III, Universität Erlangen-Nürnberg, D-91058 Erlangen — 2B.I. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine
The method of low temperature scanning laser microscopy (LTSLM) is applied to visualise the resistive state in individual Bi2Sr2Ca2Cu3O10+x filaments extracted from BSCCO/Ag tapes. The principle of measurements is based on mapping a sample voltage response as a function of the position of a focused laser beam on its surface. The method is capable of imaging distributions of both the critical currents and critical temperatures over the sample.
The investigated samples were individual BSCCO filaments extracted from tapes by a laser cutting technique using a pulsed high-power ultra-violet laser. This technique was used to define the width of a filament and to non-invasively remove the silver from its surface. No mechanical stress such as mechanical polishing was applied during preparation.
The spatial distribution of critical currents along the filaments and the distribution of the critical current density in cross sections were obtained for various tapes. Using the non-bolometric response, a spatial resolution of about 1µm is demonstrated. Spatially visualised grain boundaries between crystallites indicate Josephson behavior.