ARPES study of the superconducting gap and pseudogap in Bi2Sr2CaCu2O8+x
Journal of Physics and Chemistry of Solids(1998)
摘要
In this paper, we review some of our ARPES results on the superconducting and pseudogaps 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.
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关键词
high temperature superconductors,angle-resolved photoemission,superconductivity gap pseudogap
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