Abstract
The vortex phases in high‐quality Bi2Sr2CaCu2O8+δ single crystal have been studied by means of the in‐plane resistivity measurements in the Corbino electric contact geometry. At the angle of 89.94° of a magnetic field, titled from the c‐axis, a peak‐effect of the in‐plane resistivity was observed in the narrow field and temperature range between 79.4 K. and 82 K as a precursor of the lock‐in vortex state in the critical angular range near the ab‐plane. The strong non‐Ohmic behavior may suggest the two‐stage melting transition in parallel magnetic fields.
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