Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: SC: Poster Session
TT 9.7: Poster
Montag, 22. März 2010, 14:00–18:00, Poster A
Relaxation behaviour of levitation forces of various thin high-Tc superconductor samples — •Michael R Koblischka, Michael Becker, Jerome Meiser, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, Campus C 6 3, D-66123 Saarbrücken, Germany
We present the construction of a so-called levitation balance which is capable of measuring the levitation forces between a permanent magnet and a superconducting high-Tc thin film sample. Using this setup, we measure the relaxation behaviour of the levitation forces of different thin high-Tc samples: YBCO thin films as well as a commercial YBCO coated conductor and a piece of an Ag-sheathed Bi-2223 tape. From the relaxation curves, we obtain the pinning energies, which correspond well to the data of conventional relaxation measurements. We further show that a small movement of the sample prior to the relaxation measurement influences the relaxation behaviour drastically, so a situation with practically no relaxation effects can be generated.