HALL-EFFECT IN THE VORTEX STATE OF LA2-XSRXCUO4

We have measured the Hall effect in the vortex state of La2-xSrxCuO4 s ingle-crystal thin films from the underdoped to the overdoped regime ( x=0.1-0.24). A sign change of the Hall effect is found below T-c in th e underdoped and slightly overdoped samples, while it is absent in the overdoped samples. This result is consistent with the theoretical pre diction based on the time-dependent Ginzburg-Landau equation, which su ggests that the sign reversal is related to the electronic state at th e Fermi level.