{
  "id": "cond-mat/0005370",
  "version": "v2",
  "published": "2000-05-23T05:22:58.000Z",
  "updated": "2001-12-18T13:53:27.000Z",
  "title": "Doping dependent evolution of the electronic structure of La2-xSrxCuO4 in the superconducting and metallic phases",
  "authors": [
    "A. Ino",
    "C. Kim",
    "M. Nakamura",
    "T. Yoshida",
    "T. Mizokawa",
    "A. Fujimori",
    "Z. -X. Shen",
    "T. Kakeshita",
    "H. Eisaki",
    "S. Uchida"
  ],
  "comment": "12 pages, 10 EPSF figures, uses REVTEX",
  "journal": "Phys. Rev. B 65, 094504 (2002).",
  "doi": "10.1103/PhysRevB.65.094504",
  "categories": [
    "cond-mat.supr-con",
    "cond-mat.str-el"
  ],
  "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 $m^*/m_b \\simeq 2$ 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.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2001-12-18T13:53:27.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "electronic structure",
      "doping dependent evolution",
      "metallic phases",
      "effective mass enhancement factor",
      "superconducting gap"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. B"
    },
    "note": {
      "typesetting": "RevTeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}