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Science 23 February 2001:
Vol. 291. no. 5508, pp. 1517 - 1519
DOI: 10.1126/science.1058021
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Reports

Observation of dx2-y2-Like Superconducting Gap in an Electron-Doped High-Temperature Superconductor

T. Sato,1 T. Kamiyama,1 T. Takahashi,1* K. Kurahashi,1 K. Yamada2

High-resolution angle-resolved photoemission spectroscopy of the electron-doped high-temperature superconductor Nd2-xCexCuO4 (x = 0.15, transition temperature Tc = 22 K) has found the quasiparticle signature as well as the anisotropic dx2-y2-like superconducting gap. The spectral line shape at the superconducting state shows a strong anisotropic nature of the many-body interaction. The result suggests that the electron-hole symmetry is present in the high-temperature superconductors.

1 Department of Physics, Tohoku University, Sendai 980-8578, Japan.
2 Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan.
*   To whom correspondence should be addressed. E-mail: t.takahashi{at}msp.phys.tohoku.ac.jp

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Science. ISSN 0036-8075 (print), 1095-9203 (online)