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Critical dynamics of superconducting Bi 2 Sr 2 CaCu 2</…

2003; American Physical Society; Volume: 68; Issue: 14 Linguagem: Inglês

10.1103/physrevb.68.144516

1095-3795

Kevin Osborn, D. J. Van Harlingen, Vivek Aji, Nigel Goldenfeld, Seongshik Oh, J. N. Eckstein,

Theoretical and Computational Physics

We report on a systematic investigation of the critical fluctuations in the complex conductivity of epitaxially-grown Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ films for ${T \lesssim T_c}$ using a two-coil inductive technique at zero applied field. We observe the static 3D-XY critical exponent in the superfluid density near $T_{c}$. 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 $T_{c}$, a non-linear scaling analysis also yields a 3D dynamic exponent of $z = 2.0$.