Fully gapped single-particle excitations in lightly doped cuprates

K. M. Shen, T. Yoshida, D. H. Lu, F. Ronning, N. P. Armitage, W. S. Lee, X. J. Zhou, A. Damascelli, D. L. Feng, N. J.C. Ingle, H. Eisaki, Y. Kohsaka, H. Takagi, T. Kakeshita, S. Uchida, P. K. Mang, M. Greven, Y. Onose, Y. Taguchi, Y. TokuraSeiki Komiya, Yoichi Ando, M. Azuma, M. Takano, A. Fujimori, Z. X. Shen

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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 dx2-y2 nodal line. This effect was observed to be generic to the normal states of numerous cuprates, including hole-doped La2-xSrxCuO4 and Ca2-xNaxCuO2Cl2 and electron-doped Nd2-xCexCuO4. 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.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number5
DOIs
StatePublished - Feb 17 2004

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