Abstract
Photoemission studies of ( and have revealed that their electronic structure is essentially that of a Mott insulator, i.e., Cu 3d electrons are localized and the density of states at the Fermi level is very low. This result combined with the magnetic properties suggest a fluctuation of the local moment due to intersite exchange, which may be consistent with a bipolaron state or a resonating-valence-bond state.
- Received 10 April 1987
DOI:https://doi.org/10.1103/PhysRevB.35.8814
©1987 American Physical Society