Abstract
THE temperature-dependent magnetic penetration depth λ(T) and the superconducting coherence length ξ(T) are the two fundamental lengths in superconductivity1, and it is clearly important to determine these two quantities in the new high-transition-temperature (high-Tc) oxide superconductors2. Here we report a direct determination of λ(0) for high-quality single crystals of Bi2Sr2CaCu2O8 with a Tc of 85 K, for the particular case in which the screening currents responsible for the diamagnetism flow perpendicular to the CuO2 planes. The measured value, λc(0) = 100 ± 10 (μm, is surprisingly large, but it is consistent with the anisotropy in the electrical resistivity above Tc, measured on the same batch of single crystals, and approximately consistent with the anisotropy in lower critical field, Hc1 measured by others3. Such a large value may have important consequences for the physical properties of polycrystalline samples and thin films.
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Cooper, J., Forró, L. & Keszeit, B. Direct evidence for a very large penetration depth in superconducting Bi2Sr2CaCu2O8 single crystals. Nature 343, 444–446 (1990). https://doi.org/10.1038/343444a0
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DOI: https://doi.org/10.1038/343444a0
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