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)

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.

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)

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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)

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Chemical potential shift in lightly-doped to overdoped Bi22​Sr22​Ca1−x1−x​{\it R}xx​Cu22​O8+y8+y​ ({\it R} = Pr, Er)

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Chemical potential shift in lightly-doped to overdoped Bi22​Sr22​Ca1−x1−x​{\it R}xx​Cu22​O8+y8+y​ ({\it R} = Pr, Er)

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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)

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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)

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