Transport phenomena in the mixed state of (Bi1.6Pb0.4)Sr2Ca2(Cu1-xGax)(3)O-y bulk materials

We have performed a study of magnetoresistivity, Seebeck, Nernst and Hall e ffects in the mixed state and in the fluctuation regime above T-c0 for Bi:2 223 bulk doped with Ga (0 less than or equal to x less than or equal to 0.0 5), prepared by the conventional solid state reaction method, in magnetic f ields between 0 and 5 T and in the temperature range 5-120 K. It was found that critical temperatures, the Hall concentration, and the Nernst and Seeb eck coefficients depend strongly on the Ga contents in the samples. The Hal l resistivity rho (xy) showed a sign anomaly in the mixed state and scaled with longitudinal resistivity rho (xx) with a power coefficient beta congru ent to 2. The experimental data are in agreement with the predictions of th e time-dependent Ginzburg-Landau theory.