Evolution of electronic structure from insulator to superconductor in Bi2Sr2−xLax(Ca,Y)Cu2O8+δ
K. Tanaka, T. Yoshida, K. M. Shen, D. H. Lu, W. S. Lee, H. Yagi, A. Fujimori, Z.-X. Shen, Risdiana, T. Fujii, I. Terasaki
DOI 10.1103/PhysRevB.81.125115 · Physical Review B
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Abstract
La-doped and Y-doped Bi2Sr2CaCu2O8+δ compounds Bi2Sr2−xLax(Ca,Y)Cu2O8+δ, which range from the insulator to the deeply underdoped superconductor, have been studied by angle-resolved photoemission spectroscopy. We have observed that the lower Hubbard band (LHB) of the parent insulator is gradually shifted upward with doping without significantly changing the band dispersions, which implies a downward shift of the chemical potential with hole doping. This behavior is analogous to Bi2Sr2−xLaxCuO6+δ and Ca2−xNaxCuO2Cl2 but is different from La2−xSrxCuO4, where the LHB stays well below the chemical potential and does not move while its intensity quickly diminishes in the underdoped region.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2Ca0.8Y0.2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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