Tunneling into the normal state of Pr2-xCexCuO4 -: art. no. 187003

The temperature dependence of the tunneling conductance was measured for various doping levels of Pr2-xCexCuO4 using planar junctions. A normal state gap is seen at all doping levels studied, x=0.11 to x=0.19. We find it to vanish above a certain temperature T-*. T-* is greater than T-c for the underdoped region and it follows T-c on the overdoped side. This behavior suggests finite pairing amplitude above T-c on the underdoped side.