Electronic structure of Bi-based copper oxide superconductors: A comparative photoemission study of Bi2Sr2CaCu2O8, Bi2Sr2CuO6, and Bi2Sr2CoO6+δ

H. Eisaki; H. Takagi; S. Uchida; H. Matsubara; S. Suga; M. Nakamura; K. Yamaguchi; A. Misu; H. Namatame; A. Fujimori

doi:10.1103/PhysRevB.41.7188

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Electronic structure of Bi-based copper oxide superconductors: A comparative photoemission study of Bi2Sr2CaCu2O8, Bi2Sr2CuO6, and Bi2Sr2CoO6+δ

H. Eisaki, H. Takagi, S. Uchida, H. Matsubara, S. Suga, M. Nakamura, K. Yamaguchi, A. Misu, H. Namatame, A. Fujimori

DOI 10.1103/PhysRevB.41.7188 · Physical Review B

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Abstract

Bi-based high-Tc copper oxide superconductors, Bi2Sr2CaCu2O8, Bi2Sr2CuO6, and a related material Bi2Sr2CoO6+δ have been studied by photoemission spectroscopy. While common prominent structures at high-binding energies (>2 eV) are attributed to oxygen 2p states in the Bi-O planes, emission near the Fermi level (EF) is different from one other, indicating that these states are oxygen 2p states hybridizing with the transition-metal 3d states. For the states near EF, the resonant behavior at the Cu 3p-3d absorption threshold and the photon energy dependence of the intensities are shown to be consistent with CuO3d9–O 2p hole local singlets formed within the CuO2 planes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	unknown
Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown