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

A. Ino, C. Kim, M. Nakamura, Takashi Mizokawa, T. Mizokawa, A. Fujimori, Z. X. Shen, T. Kakeshita, H. Eisaki, S. Uchida

Research output: Contribution to journalArticle

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Abstract

The electronic structure of the La2-xSrxCuO4 (LSCO) system has been studied by angle-resolved photo-emission spectroscopy (ARPES). We report on the evolution of the Fermi surface, the superconducting gap, and the band dispersion around the extended saddle point k = (π,0) with hole doping in the superconducting and metallic phases. As hole concentration x decreases, the flat band at (π,0) moves from above the Fermi level (EF) for x>0.2 to below EF 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 (π,0) is found to monotonically increase as x decreases from x = 0.30 down to x = 0.05 even though Tc 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*/mb≃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≤0.10) are consistent with numerical works on the stripe model.

Original languageEnglish
Article number094504
Pages (from-to)945041-9450411
Number of pages8505371
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number9
Publication statusPublished - 2002 Mar 1
Externally publishedYes

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Emission spectroscopy
Electronic structure
Doping (additives)
electronic structure
Hole concentration
spectroscopy
Fermi surface
energy
Fermi level
saddle points
leading edges
Fermi surfaces
line spectra
line shape
augmentation
shift
electronics

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Doping-dependent evolution of the electronic structure of La2-xSrxCuO4 in the superconducting and metallic phases. / Ino, A.; Kim, C.; Nakamura, M.; Mizokawa, Takashi; Mizokawa, T.; Fujimori, A.; Shen, Z. X.; Kakeshita, T.; Eisaki, H.; Uchida, S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 65, No. 9, 094504, 01.03.2002, p. 945041-9450411.

Research output: Contribution to journalArticle

Ino, A, Kim, C, Nakamura, M, Mizokawa, T, Mizokawa, T, Fujimori, A, Shen, ZX, Kakeshita, T, Eisaki, H & Uchida, S 2002, 'Doping-dependent evolution of the electronic structure of La2-xSrxCuO4 in the superconducting and metallic phases', Physical Review B - Condensed Matter and Materials Physics, vol. 65, no. 9, 094504, pp. 945041-9450411.
Ino, A. ; Kim, C. ; Nakamura, M. ; Mizokawa, Takashi ; Mizokawa, T. ; Fujimori, A. ; Shen, Z. X. ; Kakeshita, T. ; Eisaki, H. ; Uchida, S. / Doping-dependent evolution of the electronic structure of La2-xSrxCuO4 in the superconducting and metallic phases. In: Physical Review B - Condensed Matter and Materials Physics. 2002 ; Vol. 65, No. 9. pp. 945041-9450411.
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