Fully gapped single-particle excitations in lightly doped cuprates

K. M. Shen et al.
Phys. Rev. B 69, 054503 – Published 17 February 2004
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Abstract

The low-energy excitations of the lightly doped cuprates were studied by angle-resolved photoemission spectroscopy. A finite gap was measured over the entire Brillouin zone, including along the dx2y2 nodal line. This effect was observed to be generic to the normal states of numerous cuprates, including hole-doped La2xSrxCuO4 and Ca2xNaxCuO2Cl2 and electron-doped Nd2xCexCuO4. In all compounds, the gap appears to close with increasing carrier doping. We consider various scenarios to explain our results, including the possible effects of chemical disorder, electronic inhomogeneity, and a competing phase.

  • Received 27 October 2003

DOI:https://doi.org/10.1103/PhysRevB.69.054503

©2004 American Physical Society

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Vol. 69, Iss. 5 — 1 February 2004

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