Chemical potential shift in lightly-doped to overdoped Bi${}_2$Sr${}_2$Ca${}_{1-x}${\it R}${}_x$Cu${}_2$O${}_{8+y}$ ({\it R} = Pr, Er)

Abstract

We have studied the chemical potential shift in the high-temperature superconductor Bi${}_2$Sr${}_2$Ca${}_{1-x}${\it R}${}_x$Cu${}_2$O${}_{8+y}$ ({\it 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 becomes slow in the underdoped region as in the case of La${}_{2-x}$Sr${}_x$CuO${}_4$ (LSCO) but the effect 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.

5 pages, 5 figures

References in corpus (1)

• Chemical Potential Shift in Nd${}_{2-x}$Ce${}_x$CuO${}_4$: Contrasting Behaviors of the Electron- and Hole-Doped Cuprates

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