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Evolution of Fermi surface and normal-state gap in the chemically substituted cuprates<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Bi</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Sr</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Bi</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:…
We have performed a systematic angle-resolved photoemission study of chemically substituted cuprates ${\text{Bi}}_{2}{\text{Sr}}_{2\ensuremath{-}x}{\text{Bi}}_{x}{\text{CuO}}_{6+\ensuremath{\delta}}$. We observed that the Fermi-surface area shrinks linearly with Bi-substitution content $x$, reflecting the electron doping nature of this chemical substitution. In addition, the spectral linewidth broadens rapidly with increasing $x$ and becomes completely incoherent at the …