Vortex-unbinding and finite-size effects in Tl2Ba2CaCu2O8 thin films

Details Vortex-unbinding and finite-size effects in Tl2Ba2CaCu2O8 thin films Vortex-unbinding and finite-size effects in Tl2Ba2CaCu2O8 thin films

2003-02-28

arxiv.org/abs/cond-mat/0302618v3

Phys. Rev. B 68(9), 094516 (2003)

Physics

Condensed Matter

Superconductivity

Typo corrected & reference added

Scientific paper

10.1103/PhysRevB.68.094516

Current-voltage ($I$-$V$) characteristics of Tl$_2$Ba$_2$CaCu$_2$O$_8$ 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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