Critical dynamics of superconducting BSCCO films

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We report on a systematic investigation of the critical fluctuations in the complex conductivity of epitaxially-grown Bi₂Sr₂CaCu₂O₈₊δ films for T Tc using a two-coil inductive technique at zero applied field. We observe the static 3D-XY critical exponent in the superfluid density near Tc. Linear scaling analysis close to the critical temperature yields a dynamic critical exponent of z = 2.0 for small drive currents, but non-linear effects are seen to be important. At Tc, a non-linear scaling analysis also yields a 3D dynamic exponent of z = 2.0.