Observation of d(x2-y2)-like superconducting gap in an electron-doped high-temperature superconductor.
High-resolution angle-resolved photoemission spectroscopy of the electron-doped high-temperature superconductor Nd(2-x)Ce(x)CuO4 (x = 0.15, transition temperature T(c) = 22 K) has found the quasiparticle signature as well as the anisotropic d(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.
Department of Physics, Tohoku University, Sendai 980-8578, Japan., Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan.
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Sato
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Kamiyama
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Takahashi
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Kurahashi
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Yamada