Abstract
We present an angle-resolved photoemission doping dependence study of the -type cuprate superconductor , from the half-filled Mott insulator to the superconductor. In , we reveal the charge-transfer band for the first time. As electrons are doped into the system, this feature’s intensity decreases with the concomitant formation of near- spectral weight. At low doping, the Fermi surface is an electron-pocket (with volume ) centered at . Further doping leads to the creation of a new holelike Fermi surface (volume ) centered at . These findings shed light on the Mott gap, its doping evolution, as well as the anomalous transport properties of the -type cuprates.
- Received 20 November 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.257001
©2002 American Physical Society