Abstract
We investigated the electronic structure of transition-metal oxide using angle-resolved photoemission, optical conductivity, x-ray absorption measurements, and first-principles band calculations. The system was found to be well described by novel effective total angular momentum states, in which the relativistic spin-orbit coupling is fully taken into account under a large crystal field. Despite delocalized Ir states, the states form such narrow bands that even a small correlation energy leads to the Mott ground state with unique electronic and magnetic behaviors, suggesting a new class of quantum spin driven correlated-electron phenomena.
- Received 23 January 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.076402
©2008 American Physical Society