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Evolution of the electronic structure from the insulator to the superconductor in Bi2Sr2-xLax(Ca,Y)Cu2O8+d

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arxiv 1002.2972 v1 pith:ER62UMXW submitted 2010-02-15 cond-mat.supr-con cond-mat.str-el

Evolution of the electronic structure from the insulator to the superconductor in Bi2Sr2-xLax(Ca,Y)Cu2O8+d

K. Tanaka , T. Yoshida , K.M. Shen , D.H. Lu , W.S. Lee , H. Yagi , A. Fujimori , Z.-X. Shen
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Risdiana T. Fujii I. Terasaki
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classification cond-mat.supr-con cond-mat.str-el
keywords insulatorbandbi2sr2-xlaxchemicalcu2o8dopingpotentialsuperconductor
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La-doped and Y-doped Bi2Sr2CaCu2O8+d (Bi2212) compounds Bi2Sr2-xLax(Ca,Y)Cu2O8+d, 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 behaviour is analogous to Bi2Sr2-xLaxCuO6+d (Bi2201) and Ca2-xNaxCuO2Cl2 (Na-CCOC) but is different from La2-xSrxCuO4 (LSCO), where the LHB stays well below the chemical potential and does not move while its intensity quickly diminishes in the underdoped region.

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