Abstract
Abstract The flux dynamics of a (Tl,Pb)(Sr,Ba) 2 Ca 2 Cu 3 O y single crystal have been investigated by means of magnetic relaxation measurements, with the applied field parallel to the c -axis. A power law dependence of the activation energy on the current density for fields less than 2 T over the temperature range 15–45 K has been observed, consistent with three-dimensional large bundle vortex creep. For intermediate fields (2–3 T), the flux dynamics are dominated by plastic vortex creep, while for fields higher than 3 T over the temperature range 16–46 K, the vortex glass scaling approach implied that a two-dimensional vortex structure is unlikely for fields less than 5 T.
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