Vortex-unbinding and finite-size effects in Tl2Ba2CaCu2O8 thin films
Abstract
Current-voltage (I-V) characteristics of Tl2Ba2CaCu2O8 thin films in zero magnetic field are measured and analyzed with the conventional Kosterlitz-Thouless-Berezinskii (KTB) approach, dynamic scaling approach and finite-size scaling approach, respectively. It is found from these results that the I-V relation is determined by the vortex-unbinding mechanism with the KTB dynamic critical exponent z=2. On the other hand, the evidence of finite-size effect is also found, which blurs the feature of a phase transition.
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