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APS » Journals » Phys. Rev. Lett. » Volume 91 » Issue 2
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Phys. Rev. Lett. 91, 027001 (2003) [4 pages]

Metallic Behavior of Lightly Doped La2-xSrxCuO4 with a Fermi Surface Forming an Arc

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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

Received 22 May 2002; published 8 July 2003

Lightly doped La2-xSrxCuO4 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 n∼x behavior of the carrier number in the underdoped and lightly doped regions.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.027001
DOI:
10.1103/PhysRevLett.91.027001
PACS:
74.25.Jb, 71.18.+y, 74.72.Dn, 79.60.–i
 
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