Abstract
We have studied the chemical potential shift in the high-temperature superconductor Er), where the hole concentration is varied from 0.025 to 0.17 per Cu, by precise measurements of core-level photoemission spectra. The result shows that the shift is depressed in the underdoped region as in the case of (LSCO) but the depression is much weaker than in LSCO. The observed shift in the present system can be relatively well explained by numerical results on the doped two-dimensional Hubbard model and suggests that the change of the electronic structure induced by hole doping is less influenced by stripe fluctuations than in LSCO.
- Received 21 January 2002
DOI:https://doi.org/10.1103/PhysRevB.67.172501
©2003 American Physical Society