Abstract
We have conducted magnetoresistance measurements ρ(T,H) in applied magnetic fields up to 18 T in Bi1.65Pb0.35Sr2Ca2Cu3O10+δ ceramic samples which were subjected to different uniaxial compacting pressures. The anisotropic upper critical fields Hc2(T) were extracted from the ρ(T,H) data, yielding \(H^{ab}_{c2}(0) \sim 130~\mathrm{T}\) and the out-of-plane superconducting coherence length ξc(0)∼3 A. We have also estimated \(H^{c}_{c2}(0) \sim 4.4~\mathrm{T}\) and ξab(0) ∼90 A. In addition to this, a flux-line-lattice (FLL) melting temperature Tm has been identified as a second peak in the derivative of the magnetoresistance dρ/dT data close to the superconducting transition temperature. An Hm vs. T phase diagram was constructed and the FLL boundary lines were found to obey a temperature dependence Hm∝(Tc/T−1)α, where α∼2 for the sample subjected to the higher compacting pressure. A reasonable value of the Lindemann parameter cL∼0.29 has been found for all samples studied.
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