ANISOTROPY OF THE NERNST EFFECT IN TEXTURED PB FREE BI2223 SUPERCONDUCTOR

Anisotropy of the Nernst effect, of the transport entropy, and of the thermal Hall angle are reported for the first time in high critical te mperature superconductors, A Pb free textured Bi2223 system has been c hosen and a field range between 0 and 4 T. The influence of the magnet ic-field direction with respect to the layered structure is emphasized . The relative evolution of the transport effects is discussed. A much stronger influence of the magnetic field along the c- than the a-axis is demonstrated, We consider various routes of interest for theoretic ally investigating the Nernst effect and the related quantities' aniso tropy, suggesting, beside the time-dependent Ginzburg-Landau formalism , to take also into account the anisotropy of the carrier relaxation t ime and density, and basically the anisotropy of the penetration depth .