Abstract
We studied the peak effects in high pressure oxygen annealed Bi2Sr2CaCu2O8+y (HPO-Bi2212) and iodine-intercalated Bi2Sr2CaCu2O8+y (I-Bi2212) single crystals by local magnetic measurements using micro Hall probes. In contrast to optimum-doped Bi2212, the peak fields (Bp) rapidly decrease with increasing temperature above around 30 K in HPO-Bi2212. Since the shape of the peak and temperature dependence ofBp in HPO-Bi2212 are similar to those in I-Bi2212, the anomalous temperature dependent peak effects in both materials may have a common origin. Such peak effects can be explained by an enhanced critical current due to field-induced pinning centers and reduction of it by a possible phase-transition in the vortex system.
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