ARPES study of the superconducting gap and pseudogap in Bi2Sr2CaCu2O8+x

TL;DR

This paper reviews ARPES results on the superconducting and pseudogaps in Bi2Sr2CaCu2O8+x, revealing doping-dependent behaviors and momentum dependence of these gaps in high-temperature superconductors.

Contribution

It provides detailed ARPES analysis of the superconducting and pseudogaps, highlighting their doping and momentum dependence in Bi2Sr2CaCu2O8+x.

Findings

Optimally and overdoped samples show a d-wave gap closing at Tc.

Underdoped samples exhibit a pseudogap up to T* > Tc.

Pseudogap closes at different temperatures for different momentum points.

Abstract

In this paper, we review some of our ARPES results on the superconducting and pseudo gaps in Bi2Sr2CaCu2O8+x. We find that optimally and overdoped samples exhibit a d-wave gap, which closes at the same temperature, Tc, for all k points. In underdoped samples, a leading edge gap is found up to a temperature T* > Tc. We find that T* scales with the maximum low temperature gap, increasing as the doping is reduced. The momentum dependence of the pseudogap is similar to that of the superconducting gap; however, the pseudogap closes at different temperatures for different k points.