Doping evolution of the electronic structure in the single-layer cuprates Bi$_2$Sr$_{2-x}$L.pdf
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Doping evolution of the electronic structure in the single-layer cuprates Bi$_2$Sr$_{2-x}$L
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Doping evolution of the electronic structure in the single-layer cuprates
Bi2Sr2?xLaxCuO6+δ: Comparison with other single-layer cuprates
M. Hashimoto, T. Yoshida, H. Yagi, M. Takizawa, and A. Fujimori
Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan
M. Kubota and K. Ono
Photon Factory, Institute of Materials Structure Science,
High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, 305-0801, Japan
K. Tanaka, D.H. Lu, and Z.-X. Shen
Department of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory,
Stanford University, Stanford, California 94305, U.S.A.
S. Ono
Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan.
Yoichi Ando
Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
(Dated: March 11, 2008)
We have performed angle-resolved photoemission and core-level x-ray photoemission studies of
the single-layer cuprate Bi2Sr2?xLaxCuO6+δ (Bi2201) and revealed the doping evolution of the elec-
tronic structure from the lightly-doped to optimally-doped regions. We have observed the formation
of the dispersive quasi-particle band, evolution of the Fermi “arc” into the Fermi surface and the
shift of the chemical potential with hole doping as in other cuprates. The doping evolution in Bi2201
is similar to that in Ca2?xNaxCuO2Cl2 (Na-CCOC), where a rapid chemical potential shift toward
the lower Hubbard band of the parent insulator has been observed, but is quite different from that
in La2?xSrxCuO4 (LSCO), where the chemical potential does not shift, yet the dispersive band
and the Fermi arc/surface are formed around the Fermi level already in the lightly-doped region.
The (underlying) Fermi surface shape and band dispersions are quantitatively analyzed using tight-
binding fit, and the deduced next-nearest-neighbor hopping integral t′ also confirm t
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