Abstract
To date, angle-resolved photoemission spectroscopy has been successful in identifying energy scales of the many-body interactions in correlated materials, focused on binding energies of up to a few hundred meV below the Fermi energy. Here, at higher-energy scale, we present improved experimental data from four families of high- superconductors over a wide doping range that reveal a hierarchy of many-body interaction scales focused on: the low-energy anomaly (“kink”) of , a high-energy anomaly of , and an anomalous enhancement of the width of the local-density-approximation-based band extending to energies of . Besides their universal behavior over the families, we find that all of these three dispersion anomalies also show clear doping dependence over the doping range presented.
- Received 20 December 2006
DOI:https://doi.org/10.1103/PhysRevB.75.174506
©2007 American Physical Society