Abstract
Although more than 20 years have passed, the identification of the superconducting order parameter in cuprates is still under debate. Here, we show that the gap size near the nodes is a good candidate for the order parameter: it scales with the critical temperature over a wide doping range and displays a significant temperature dependence below in both the underdoped and the overdoped regimes. In contrast, the gap size at the antinodes does not scale with in the underdoped regime and appears to be controlled by the pseudogap which persists below .
- Received 21 February 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.097003
©2008 American Physical Society