MAGNETOTRANSPORT STUDIES OF BI-BASED-2212 AND BI-BASED-2223 HIGH CRITICAL-TEMPERATURE SUPERCONDUCTORS

When a magnetic field is superimposed on a superconducting sample the electric and temperature gradients allow one to observe phenomena call ed excess electrical resistivity, excess thermoelectric power, Nernst effect, and excess magnetothermal conductivity. Interesting parameter values can be obtained on vortex and quasi-particle scatterings in the mixed state of materials. For illustration we examine the case of sev eral Bi-based 2212 and 2223 superconducting ceramics. A new (linear) r elationship is found between the Ginzburg-Landau parameter and the vor tex viscosity. A discussion is given on a new way to get some informat ion on the order parameter symmetry from such transport properties thr ough the analysis of the temperature-integrated excess quantity field dependence in the mixed state.