Abstract
The relationship between the thermodynamic vortex lattice melting transition and the peak effect in Bi2Sr2CaCu2O8+y is studied using a micro Hall probe. We observe a clear step in the local magnetization above a critical point of about 37 K in agreement with the previous report by Zeldov et al. showing the presence of the first-order vortex lattice melting transition in this system. At temperatures below the critical point, the peak effect with temperature independent peak field is also observed. These two phenomena occur on a single line in the B-T phase diagram suggesting an interference of these two phenomena. Another peak effect coexists with the vortex lattice melting transition in a narrow temperature region above the critical point. We propose that the peak effect in the coexisting region is caused by the synchronization of vortices to the pinning centers due to the reduction of the shear modulus towards the melting transition.
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