Transport phenomena in the mixed state and fluctuation regime in (Bi1.6Pb0.4)Sr2Ca1-xHox (Cu1-yZny)(2)O8+d

Measurements of the magnetoresistivity, Seebeck, Nernst and Hall coefficien ts in Bi:2212 superconductors doped with Ho and Zn are reported. The critic al temperature and the transport coefficients depend strongly on the Ho and Zn contents. The tails of the transport coefficients versus temperature cu rves are caused by fluctuation effects, which increase with increasing magn etic field. An anomalous suppression of superconductivity at x = 0.25-0.35 and y = 0.025-0.032 was also found when the hole concentration per Cu is H- P = 1/8 and the transport properties exhibit metallic behavior. It was foun d that dB(c2)/dT = -2.4 +/-0.2 T/K, corresponding to a Ginzburg Landau cohe rence length xi = 15 Angstrom. The Hall resistivity rho (xy) scaling with t he longitudinal resistivity rho (xx) as rho (xy)(T) = a(-1)rho (alpha)(xx) with alpha approximate to 1.8 is in agreement with the theory of Vinokur et al. The experimental data in the mixed state are in agreement with the pre diction of the time-dependent Ginzburg-Landau theory.