Tunneling into the normal state of Pr(2-x)CexCuO4
Y. Dagan, M. M. Qazilbash, R. L. Greene
TL;DR
This study investigates the normal state gap in Pr(2-x)CexCuO4 across various doping levels, revealing a finite pairing amplitude above Tc in underdoped samples, indicating unconventional superconducting behavior.
Contribution
It provides detailed tunneling conductance measurements showing the presence of a normal state gap and its temperature dependence across doping levels in electron-doped cuprates.
Findings
Normal state gap observed at all doping levels studied.
T* exceeds Tc in underdoped samples, indicating pairing above Tc.
T* follows Tc in overdoped samples.
Abstract
The temperature dependence of the tunneling conductance was measured for various doping levels of Pr(2-x)CexCuO4 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 Tc for the underdoped region and it follows Tc on the overdoped side. This behavior suggests finite pairing amplitude above Tc on the underdoped side.
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