Two different (small and large) pseudogaps have been observed by ultrahigh-resolution photoeraission spectroscopy in optimally doped Bi2Sr2CaCu2O8 and La1.85Sr0.15GuO4. The small pseudogap is smoothly connected from the superconducting gap and closes slightly above Tc, while the large one appears as a remarkable depletion of the density of states in a wider energy range near EF and persists far above Tc. The small pseudogap is likely associated with pairing and the large one is ascribed to the development of antiferromagnetic correlation.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering