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- W1994706475 abstract "Abstract Accurate measurements of the AC susceptibility χ ( T ) have been performed on oriented YBa 2 Cu 3 O 7 powder samples of various calibrated sizes at nearly perfect O 7 oxygen stoichiometry with an AC magnetic field applied either perpendicular or parallel to the ab plane. The changes in χ ( T ) with the average crystallite size and with the field direction are analyzed. The temperature variations of χ ( T ) directly reflect those of λ ( T ) and in both directions a quadratic temperature dependence is found for T T c . This result differs markedly from those obtained by surface impedance measurements on single crystals by Hardy et al. and is inconsistent with a BCS model with an isotropic superconducting gap. The variations of χ (4.2 K) as a function of the grain size suggest that the penetration depth actually measured is dominated by λ c in both directions. The difference between the microwave and susceptibility data might then be associated with differences in the temperature dependence of λ ab and λ c ." @default.
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- W1994706475 date "1995-09-01" @default.
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- W1994706475 title "Possible origin for the T2 dependence of the penetration depth detected by susceptibility measurements in aligned YBa2Cu3O7 powder samples" @default.
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- W1994706475 doi "https://doi.org/10.1016/0921-4534(95)00419-x" @default.
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