HALL ANOMALY IN THE SUPERCONDUCTING STATE OF HIGH-T-C CUPRATES - UNIVERSALITY IN DOPING DEPENDENCE

We have measured the flux flow Hall effect in the superconducting stat e of various high-T-c superconductors (HTSC) from the underdoped to th e overdoped regime. We show that the Hall sign is universal and is det ermined by the doping level; the sign is electronlike in the underdope d regime and holelike in the overdoped regime. This tendency contradic ts the prediction or the time dependent Ginzburg-Landau equation based on the s-wave weak coupling theory, suggesting that such a theory fai ls to evaluate the Hall force acting on the vortices in HTSC. This dis crepancy may be attributed to the novel electronic structure of the vo rtex in HTSC.