Doping-dependent Evolution of the Electronic Structure of La2-xSrxCuO4 in the Superconducting and Metallic Phases
By A. Ino, Changyoung Kim, M. Nakamura, T. Yoshida, T. Mizokawa, A. Fujimori, Zhi-xun Shen, T. Kakeshita, H. Eisaki, S. Uchida. 2000
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The electronic structure of the ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ (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 $\mathbf{k}=(\ensuremath{\pi},0)$ with hole doping in the superconducting and metallic phases. As hole concentration x decreases, the flat band at $(\ensuremath{\pi},0)$ moves from above the Fermi level ${(E}_{\mathrm{F}})$ for $xg0.2$ to below ${E}_{\mathrm{F}}$ for $xl0.2,$ and is further lowered down to $x=0.05.$ From the leading-edge shift of ARPES spectra, the magnitude of the superconducting gap around $(\ensuremath{\pi},0)$ 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 line shape are analyzed using a simple phenomenological self-energy form, and the electronic effective mass enhancement factor ${m}^{*}{/m}_{b}\ensuremath{\simeq}2$ 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 $(x\ensuremath{\lesssim}0.10)$ are consistent with numerical works on the stripe model.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/9cc3fece3a4645dc9e3492fd8f80da1888d66193
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Citations in the corpus
- Angle-resolved photoemission studies of the cuprate superconductors (2002, background): “Careful investigations by Ino et al. (2002) indicated that the Fermi surface changes from holelike to electronlike for x.0.15–0.2 as the saddle point moves from below to above EF , consistent with LDA calculations.”