Thermodynamical fluctuations and critical behavior in weakly disordered YBCO thin and ultrathin films

Jerome Lesueur; S. Degoy; Marco Aprili; D. Chambonnet; D. Keller

doi:10.1117/12.250233

5 July 1996 Thermodynamical fluctuations and critical behavior in weakly disordered YBCO thin and ultrathin films

Jerome Lesueur, S. Degoy, Marco Aprili, D. Chambonnet, D. Keller

Proceedings Volume 2697, Oxide Superconductor Physics and Nano-Engineering II; (1996) https://doi.org/10.1117/12.250233
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

The specific role of disorder in the transport properties of YBCO has been investigated, using both light-ion irradiation of thin films to finely tune the amount of atomic disorder, and ultra-thin films grown to study possible dimensional effects. For weak disorder, the samples display a resistive transition typical of the mean-field paraconductive regime of an homogeneous media, well described by the Lawrence and Doniach model for layered superconductors. As the disorder increases, two effects take place. First, the c-axis coherence length becomes shorter, leading to a more anisotropic material, as shown by the excess conductivity above Tc. Second, an incipient granularity is revealed, leading to a less sharper transition, which is analyzed within the random 3D XY critical model for the paracoherence transition. Two main results are derived: and experimental test of the Ginzburg criteria for the paracoherence transition, and a new fluctuation regime in a nanometric grain size superconductors.

Citation Download Citation

Jerome Lesueur, S. Degoy, Marco Aprili, D. Chambonnet, and D. Keller "Thermodynamical fluctuations and critical behavior in weakly disordered YBCO thin and ultrathin films", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); https://doi.org/10.1117/12.250233

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