The nodal gap component as a good candidate for the superconducting order parameter in cuprates

Details The nodal gap component as a good candidate for the superconducting order parameter in cuprates The nodal gap component as a good candidate for the superconducting order parameter in cuprates

2008-02-21

arxiv.org/abs/0802.3166v1

Phys.Rev. Lett. 101, 097003 (2008)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.101.097003

Although more than twenty years have passed since the discovery of high temperature cuprate superconductivity, the identification of the superconducting order parameter is still under debate. Here, we show that the nodal gap component is the best candidate for the superconducting order parameter. It scales with the critical temperature $T_c$ over a wide doping range and displays a significant temperature dependence below $T_c$ in both the underdoped and the overdoped regimes of the phase diagram. In contrast, the antinodal gap component does not scale with $T_c$ in the underdoped side and appears to be controlled by the pseudogap amplitude. Our experiments establish the existence of two distinct gaps in the underdoped cuprates.

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