Abstract
A study has been carried out on the second peak effect of Bi 2Sr 2CaCu 2O 8+ δ single crystal with excessive oxygen doping based on its magnetization data. The low temperature ( T<30 K) magnetization curve reveals a full valley structure on the temperature dependent curves of both second peak field H sp( T) and its corresponding onset field H on( T), in conjunction with the appearance of a much broader temperature range of the peak effect. The high temperature ( T>30 K) data are shown to exhibit a transition from ordered to glassy flux line state. The data for H on( T) in those two temperature regimes have been nicely fitted with corresponding theoretical models for strong disorder induced effects.
Published Version
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