Phys. Rev. B 67, 172501 (2003) [4 pages]Chemical potential shift in lightly doped to overdoped Bi2Sr2Ca1-xRxCu2O8+y (R=Pr, Er)Received 21 January 2002; revised 27 December 2002; published 1 May 2003 We have studied the chemical potential shift in the high-temperature superconductor Bi2Sr2Ca1-xRxCu2O8+y (R=Pr, 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 La2-xSrxCuO4 (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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.172501
DOI:
10.1103/PhysRevB.67.172501
PACS:
79.60.-i, 74.72.Hs, 71.30.+h
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