Abstract
Through a combined scanning tunneling microscopy and angle-resolved photoemission spectroscopy study, we report the observation of two distinct gaps (a small and a large gap) that coexist both in real space and in the antinodal region of momentum space, below the superconducting transition temperature () of . We show that the small gap is associated with superconductivity. The large-gap persists above , and seems linked to observed charge ordering. We find a strong correlation between the large and small gaps suggesting that they are affected by similar physical processes.
- Received 22 July 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.207002
©2008 American Physical Society