Abstract
We present detailed experimental data of the magnetization, Mab(T,H), of Bi2Sr2CaCu2O8 and YBa2Cu3O7−δ crystals on both sides of the superconducting transition, for magnetic fields, H, applied perpendicularly to the ab (CuO2) planes. The data are analyzed in terms of thermal fluctuations in the weak H limit: In the reversible mixed state below the transition, by taking into account the vortex fluctuations, as first proposed by Bulaevskii, Ledvij and Kogan, which are much more important in the Bi-based compounds. Above the transition, by taking into account the order parameter amplitude fluctuations (OPF), through a generalization to multilayered superconductors of the Schmidt-like approach.
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Mosqueira, J., Ramallo, M.V., Pomar, A. et al. Thermal fluctuation effects on the magnetization above and below the superconducting transition in Bi2Sr2CaCu2O8 and YBa2Cu3O7−δ crystals in the weak magnetic field limit. J Low Temp Phys 105, 1111–1116 (1996). https://doi.org/10.1007/BF00753848
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DOI: https://doi.org/10.1007/BF00753848