Doping dependent evolution of the electronic structure of La2-xSrxCuO4 in the superconducting and metallic phases

Abstract

The electronic structure of the La${}_{2-x}$Sr${}_x$CuO${}_4$ (LSCO) system has been studied by angle-resolved photoemission spectroscopy (ARPES). We report on the evolution of the Fermi surface, the superconducting gap and the band dispersion around the extended saddle point $k=(\pi ,0)$ with hole doping in the superconducting and metallic phases. As hole concentration $x$ decreases, the flat band at $(\pi ,0)$ moves from above the Fermi level ($E_F$) for $x>0.2$ to below $E_F$ for $x<0.2$, and is further lowered down to $x=0.05$. From the leading-edge shift of ARPES spectra, the magnitude of the superconducting gap around $(\pi ,0)$ is found to monotonically increase as $x$ decreases from $x=0.30$ down to $x=0.05$ even though $T_c$ decreases in the underdoped region, and the superconducting gap appears to smoothly evolve into the normal-state gap at $x=0.05$. It is shown that the energy scales characterizing these low-energy structures have similar doping dependences. For the heavily overdoped sample ($x=0.30$), the band dispersion and the ARPES spectral lineshape are analyzed using a simple phenomenological self-energy form, and the electronic effective mass enhancement factor $m^{\ast }/m_b\simeq 2$ has been found. As the hole concentration decreases, an incoherent component that cannot be described within the simple self-energy analysis grows intense in the high-energy tail of the ARPES peak. Some unusual features of the electronic structure observed for the underdoped region ($x\lesssim 0.10$) are consistent with the numerical works on the stripe model.

12 pages, 10 EPSF figures, uses REVTEX

References in corpus (4)

• Superconductivity from Flat Dispersion Designed in Doped Mott Insulators
• The Fermi surface of Bi2Sr2CaCu2O8
• One-dimensional metallic behavior of the stripe phase in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Electronic Structure of Stripes in Two-Dimensional Hubbard Model

Cited by in corpus (151)

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• Theory of Superconductivity in Strongly Correlated Electron Systems
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• A new hybrid LDA and Generalized Tight-Binding method for the electronic structure calculations of strongly correlated electron systems
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• Doping dependence of charge-transfer excitations in La_{2-x}Sr_xCuO_4
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