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Effects of Pb substitution on the vortex state of oxygen-overdoped Bi 2 Sr 2 CaCu 2 O 8¿d single crystal

We show that excessive Pb substitution of Bi in oxygen-overdoped BSCCO-2212 single crystal further reduces the anisotropy ( r c /r a ratio! of the system in addition to enhancing disorder in its vortex system. These effects have led to the suppression of first-order vortex melting as well as a peculiar second-peak effect exhibiting a sensitive temperature dependence over an unusually broad temperature range. Our experimental data further reveal, in a Bi-based system, the presence of a disentangled vortex liquid phase separating the solid vortex from the entangled vortex liquid phase in the H-T diagram constructed from the transport and magnetization data.