Flux Dynamics and Vortex Phase Diagram in Tl₂Ba₂CaCu₂O₈ Thin Films

ISSN： 0022-2291

Source： Journal of Low Temperature Physics, Vol.117, Iss.5-6, 1999-12, pp. : 1411-1415

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Abstract

By doing sensitive magnetic measurement, the current-voltage ( I-V or E-j ) characteristics were determined for Tl₂Ba₂CaCu₂O₈ thin films at temperatures between 4.2 K and 70 K in magnetic fields up to 6T. We found a crossover of the dimensionality of flux dynamics from 3D at low fields to 2D at high fields. The vortex matter melts at a finite temperature at a low field ( 3D ) and at zero K at a high field ( 2D ). Finally we attempt to give a vortex phase diagram based on this analysis.

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