Vortex motion and energy dissipation in single crystal (BiPb)SrCaCuO

✍ Scribed by A.K. Pradhan; S.J. Hazell; J.W. Hodby; C. Chen; Hu. Y.; B.M. Wanklyn

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 491 KB
• Volume: 204
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)91016-o

✦ Synopsis

We have measured the magnetoresistance and I-V characteristics both in with and without magnetic fields, applied parallel to the a&plane at different temperatures in single crystal Bi,.6Pb0.4Sr2Ca2Cu30v The I-Vcharacteristics in both cases obey the power law behaviour, VCIZI"(~). The zero-field power law exponents clearly show the existence of a Nelson-Kosterlitz jump conforming the transition to be KT-type. The observation of a clear power law in the Z-V characteristics, an abrupt change in the magnetic field dependent power law exponent at 2 T along with a non-linear behaviour in the magnetoresistance predicts a Lorentz-force independent dissipation which can be explained in terms 9f two-dimensional vortex-antivortex pair breaking because of the caxis misalignment within the crystal. The effect of a magnetic field on the KT transition has been explained in terms of excessive vortices induced b f the magnetic field.