Maqola

Electronic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>in the vicinity of the superconductor-insulator transition

A. InoDepartment of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, JapanC. KimDepartment of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305Masaaki NakamuraDepartment of Physics, Nara University of Education, Takabatake-cho, Nara 630-8528, JapanT. YoshidaDepartment of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, JapanT. MizokawaDepartment of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, JapanZhi‐Xun ShenDepartment of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305A. FujimoriDepartment of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, JapanT. KakeshitaDepartment of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, JapanHiroshi EisakiDepartment of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, JapanS. UchidaDepartment of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan

2000lv

ABI

Annotatsiya

We report on the result of angle-resolved photoemission study of ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ (LSCO) from an optimally doped superconductor $(x=0.15)$ to an antiferromagnetic insulator $(x=0).$ Near the superconductor-insulator transition $x\ensuremath{\sim}0.05,$ spectral weight is transferred with hole doping between two coexisting components, suggesting a microscopic inhomogeneity of the doped-hole distribution. For the underdoped LSCO $(x<~0.12),$ the dispersive band crossing the Fermi level becomes invisible in the $(0,0)\ensuremath{-}(\ensuremath{\pi},\ensuremath{\pi})$ direction unlike ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+y}.$ These observations may be reconciled with the evolution of holes in the insulator into fluctuating stripes in the superconductor.

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DOI: 10.1103/physrevb.62.4137

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