OUT-OF-PLANE TRANSVERSE RESISTIVITY IN HIGH-T-C SUPERCONDUCTORS AS A SIGNATURE OF FLOW OF RIGID VORTEX LINES

When the transport current is applied parallel to the CuO2 layers, say , along the a axis, of a high-T-c superconductor, and the magnetic fie ld B is in a direction which makes a polar angle theta with the c axis and an azimuthal angle phi with the ac plane, for the case of rigid f lux lines, in addition to the usual longitudinal resistivity rho(perpe ndicular to), there should also exist an out-of-plane transverse resis tivity rho(perpendicular to), which is of the same order of magnitude as rho(perpendicular to) and satisfies the relation \rho(perpendicular to)/rho(parallel to)\ =tan theta cos phi in the high anisotropy limit and for theta being not very close to pi/2. For less rigid flux lines , reduction in \rho(perpendicular to)\rho(parallel to)\ from this pred iction should be observed, and for a set of decoupled pancake vortices , rho(perpendicular to) should vanish entirely.