Abstract

The linear ac magnetic response of three Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital x}} single crystals with various doping states was investigated with a miniature two-coil mutual inductance technique in magnetic fields parallel to the {ital c} axis. The dissipation peak appeared right below {ital T}{sub {ital c}}, and a drop in dissipation was observed at a frequency-independent temperature {ital T}{sub {ital D}} together with an increase in shielding signal, upon field cooling the sample. The observed frequency-independent feature can be understood as a consequence of the thermally induced dimensional crossover.

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