Abstract
The magnetic response of a single-crystal YBa 2Cu 3O y bulk specimen was measured in terms of complex susceptibilities χ n = χ n ′− iχ n ″ ( n=1,2,3,5,7). The observed non-linear magnetic response as a function of temperature was analyzed within the framework of the modified Kim–Anderson critical-state model, where the surface barrier Δ H and the lower critical field H cl are explicitly taken into consideration. Analyses have revealed that χ n can be well reproduced only when Δ H has a non-zero value. The best fit of the data gave μ 0Δ H(0)≈80 mT. The intrinsic value of the surface barrier μ 0Δ H′(0)≈440 mT evaluated by correcting for the demagnetization effect would be attributed to the Bean–Livingston (BL) barrier.
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