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00925njm 22002777a 4500 dc Sefrioui, Z. author Arias, D. author Leon, C. author Santamaría Sánchez-Barriga, Jacobo author González Herrera, Elvira María author Vicent López, José Luis author 2004-08 We investigate the zero-magnetic-field dynamic scaling in Bi_2Sr_2CaCu_2O_8 thin films from nonlinear current-voltage (I-V) characteristics and by using the concavity criterion recently proposed by Strachan [Phys. Rev. Lett. 87, 067007 (2001)] . We find that fresh samples show a BKT-like transition with z=0.8, smaller than expected for a conventional Berezinskii-Kosterlitz- Thouless transition. The effect of sample size and finite Josephson coupling are discussed. We examine the effect of thermally-induced disorder in the oxygen sublattice finding that the BKT-like transition is suppressed by point disorder. 1098-0121 10.1103/PhysRevB.70.064502 https://hdl.handle.net/20.500.14352/52081 http://dx.doi.org/10.1103/PhysRevB.70.064502 https://journals.aps.org Zero-magnetic-field dynamic scaling in Bi_2Sr_2CaCu_2O_8 thin films