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Flux line pinning in YBa2Cu3O7–δ observed with a vibrating bar

✍ Scribed by D.J. Baar; S. Graham; J.P. Harrison; V. Storm

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
248 KB
Volume
29
Category
Article
ISSN
0011-2275

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✦ Synopsis

A study of flux pinning has been performed using an oscillator consisting of a bar of sintered YBa2Cu307~ ceramic, clamped at both ends, which was made to perform flexural vibrations in a transversely applied magnetic field. Vibrations were driven by an alternating current flowing along the bar. The viscous motion of flux lines produced a current-and field-dependent damping of the oscillator, which was observed in the resonance response of the voltage induced along the bar. Flux line de-pinning was observed as a well defined damping peak in the temperature range 30-80 K. The de-pinning temperature was found to vary with current and magnetic field. The device has been studied in magnetic fields of 0.5 to 3T, at temperatures from 10 to 130 K, and with current densities in the range 5-500 mA cm-2.

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