Regensburg 2000 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 17: Postersitzung II: Pinning und Vortexdynamik (1-8), Supraleitung: Theorie (9-13), Korrelierte Elektronen (14-48), Niederdimensionale Systeme (49-68), Quantenflüssigkeiten (69-75)
TT 17.2: Poster
Mittwoch, 29. März 2000, 14:30–18:00, A
Vibrating Reed Studies of Superconductors with Anisotropic Order Parameter — •A. Karelina, H.F. Braun, M. Endres, W. Ettig, M. Kulic, and D. Rainer — Physikalisches Institut, Universität Bayreuth, Universitätsstraße 30, 95440 Bayreuth
Pinning of flux lines on point-like defects depends on both the magnitude and symmetry of the order parameter and the coupling strength of the pinning sites. We study pinning at point-like defects in untwinned single crystals of YBa2Cu3O7−δ. In this material, pinning should be dominated by oxygen-defects. The density of these defects can be controlled by annealing under oxygen pressure or in reducing atmosphere. The reactive and dissipative pinning forces are measured with the vibrating reed technique [1]. We compare the data with calculations in the limit of small oscillations of the flux lines in their pinning potential.
[1] P. Esquinazi, J. Low Temp. Phys. 85 (1991) 139