MIXED-STATE THERMOELECTRIC AND THERMOMAGNETIC EFFECTS OF A BI2SR2CACU2O8+DELTA SINGLE-CRYSTAL

We examined the electric and thermoelectric transport properties of a superconducting Bi2Sr2CaCu2O8+delta single crystal. The magnetic fields lower than 4 T were applied perpendicular to the electrical or thermal gradient along the c axis. All properties are described in terms of temperature-integrated excess quantities as a function of the magnetic field. Power-law exponents are compared to those found on other two-dimensional (2D) and 3D polycrystalline or textured systems. The apparent dimensionality of the system is emphasized. The values of various derived quantities are also given and compared to those of other high-temperature superconductors. These quantities are the vortex transport entropy (ca. 10(-15) J/K m), the viscous damping coefficient (1.2 X 10(-9) J s/m(3) at 78 K), the Ginzburg-Landau parameter (between 70 and 120), the thermal Hall angle, and the activation energies for each transport property. The findings point out the need of including the system dimensionality and various vortex pinning and vortex scattering effects in theoretical calculations.