Journal
PHYSICAL REVIEW LETTERS
Volume 94, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.187003
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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.
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