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

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Science  23 Feb 2001:
Vol. 291, Issue 5508, pp. 1517-1519
DOI: 10.1126/science.1058021

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Abstract

High-resolution angle-resolved photoemission spectroscopy of the electron-doped high-temperature superconductor Nd2-xCexCuO4 (x = 0.15, transition temperature T c = 22 K) has found the quasiparticle signature as well as the anisotropicd x2-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.

  • * To whom correspondence should be addressed. E-mail: t.takahashi{at}msp.phys.tohoku.ac.jp

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