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Lorentz-Force Independence of Resistance Tails for High-Temperature Superconductors in Magnetic Fields Near T sub c

An unusual loss mechanism is commonly observed in the high-temperature superconductors in a magnetic field near the zero-field transition temperature T sub c . Resistive transitions in highly c-axis-oriented Tl sub 2 Ba sub 2 CaCu sub 2 O sub x thin films are presented as a function of field perpend...

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Bibliographic Details
Published in:Physical review letters 1989-10, Vol.63 (17), p.1877-1879
Main Authors: Woo, K C, Gray, K E, Kampwirth, R T
Format: Article
Language:English
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Summary:An unusual loss mechanism is commonly observed in the high-temperature superconductors in a magnetic field near the zero-field transition temperature T sub c . Resistive transitions in highly c-axis-oriented Tl sub 2 Ba sub 2 CaCu sub 2 O sub x thin films are presented as a function of field perpendicular to the C axis for the current both perpendicular and parallel to the field. The data are essentially the same over a span of five orders of magnitude below the normal-state resistance. Since the macroscopic Lorentz force is zero for the current parallel to the magnetic field, it plays, at most, a significantly reduced role in this loss mechanism. These results seriously question any explanation of these losses based on magnetic-flux motion. Graphs. 15 ref.--AA
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.63.1877