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TT: Tiefe Temperaturen
TT 19: Postersitzung III: Josephsonkontakte(1-25), SQUIDs, Sensoren, Detektoren(26-37), Supraleitung in Hochfrequenz und Elektronik(38-45), Präparation und Dotierung von HTSL(46-53), NMR und Ultraschall in HTSL(54-60), Thermodynamik, Magnetismus(61-68), Transporteigenschaften von HTSL(69-73), Spektroskopie, Ramanstreuung, param. Meissner-Effekt in HTSL(74-84), n-dotierte HTSL(85-91)
TT 19.57: Poster
Donnerstag, 20. März 1997, 15:30–19:00, Z1
Mechanical response of vibrating high-Tc superconducting films under a dc-current — •F. Ciovacco1, P. Esquinazi1, and M. Lorenz2 — 1Abteilung Supraleitung und Magnetismus, Universität Leipzig, 04103 Leipzig — 2Institut für Experimental Physik II, Universität Leipzig, 04103 Leipzig
We have studied the response of vibrating high-Tc thin films in a magnetic field as a function of dc current. The used experimental setup is similar to the vibrating reed arrengement; instead of the usual capacitive detection method, we use laser interferometry which provides larger sensitivity. Preliminary results indicate a relatively large shift of the thermally activated depinning transition with current. For example, the depinning temperature of a 200 nm thin film of Y123 superconductor decreases 2 K by applying a dc current of 50 mA.