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Il Nuovo Cimento D

, Volume 19, Issue 8–9, pp 1295–1300 | Cite as

Fluctuational dissipation in YBCO under magnetic fields

  • S. Sarti
  • V. Boffa
  • R. Fastampa
  • M. Giura
  • R. Marcon
  • E. Silva
Article
  • 16 Downloads

Summary

We present some experimental facts which suggest that fluctuational phenomena dictate the dissipative behaviour in a wide region of fields and temperatures across the critical temperatureT c. In particular, we discuss resistivity data on an YBCO thin film as a function of the field orientation ϑ with respect to the crystallographic axes of the sample. We also compare our data with those taken on an untwinned single crystal. Both analyses define a temperatureT f(H) marking the onset of extrinsic effects on the dissipation. Finally, the comparison of the data with the predictions of the interacting fluctuations theory and with the Bardeen-Stephen flux-flow expression is used to clarify whether the intrinsic behaviour is due to fluctuations of the order parameter or to the free motion of vortex lines.

PACS 74.40

Fluctuations (noise, chaos, nonequilibrium superconductivity, localization etc.) 

PACS 01.30.Cc

Conference proceedings 

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Copyright information

© Società laliana di Fisica 1997

Authors and Affiliations

  • S. Sarti
    • 1
    • 2
  • V. Boffa
    • 2
  • R. Fastampa
    • 1
  • M. Giura
    • 1
  • R. Marcon
    • 3
  • E. Silva
    • 3
  1. 1.Dipartimento di Fisica and INFMUniversità “La Sapienza”RomaItaly
  2. 2.Centro Ricerche FrascatiENEAFrascati (Roma)Italy
  3. 3.Dipartimento di Fisica “E. Amaldi” and INFMUniversità “Roma Tre”RomaItaly

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