We have measured the flux flow Hall effect in the superconducting state of various high- Tc superconductors (HTSC) from the underdoped to the overdoped regime. We show that the Hall sign is universal and is determined by the doping level
the sign is electronlike in the underdoped regime and holelike in the overdoped regime. This tendency contradicts the prediction of the time dependent Ginzburg-Landau equation based on the s-wave weak coupling theory, suggesting that such a theory fails to evaluate the Hall force acting on the vortices in HTSC. This discrepancy may be attributed to the novel electronic structure of the vortex in HTSC. © 1998 The American Physical Society.