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The in-plane resisitivity ρ of YBCO crystals measured in samples 1 (y = 6.23), 2 (6.30), 3 (6.36), 4 (6.40), 5 (6.45), and 6 (6.63) (the data in samples 1–3 are reduced by the factors shown). Broken lines for samples 1–3 represent ρ in a 14-T field H ∥ ĉ (in sample 1, the broken line nearly coincides with the zero-H data). The inset shows the magnetization curves taken with H = 10 Oe in samples 3 and 5.
