Metallic Behavior of Lightly Doped La2xSrxCuO4 with a Fermi Surface Forming an Arc

T. Yoshida, X. J. Zhou, T. Sasagawa, W. L. Yang, P. V. Bogdanov, A. Lanzara, Z. Hussain, T. Mizokawa, A. Fujimori, H. Eisaki, Z.-X. Shen, T. Kakeshita, and S. Uchida
Phys. Rev. Lett. 91, 027001 – Published 8 July 2003


Lightly doped La2xSrxCuO4 in the so-called “insulating” spin-glass phase has been studied by angle-resolved photoemission spectroscopy. We have observed that a “quasiparticle” (QP) peak crosses the Fermi level in the node direction of the d-wave superconducting gap, forming an “arc” of Fermi surface, which explains the metallic behavior at high temperatures of the lightly doped materials. The QP spectral weight of the arc smoothly increases with hole doping, which we attribute to the nx behavior of the carrier number in the underdoped and lightly doped regions.

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  • Received 22 May 2002


©2003 American Physical Society

Authors & Affiliations

T. Yoshida1,2, X. J. Zhou2, T. Sasagawa3, W. L. Yang4, P. V. Bogdanov2, A. Lanzara2,4, Z. Hussain4, T. Mizokawa1, A. Fujimori1, H. Eisaki2, Z.-X. Shen2, T. Kakeshita3, and S. Uchida3

  • 1Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 2Department of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
  • 3Department of Advanced Materials Science, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 4Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

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Vol. 91, Iss. 2 — 11 July 2003

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