Bulk electronic structures and strong electron-phonon interactions in an electron-doped high-temperature superconductor

M. Tsunekawa, A. Sekiyama, S. Kasai, S. Imada, H. Fujiwara, T. Muro, Y. Onose, Y. Tokura, S. Suga

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18 Citations (Scopus)

Abstract

We have performed soft x-ray angle-resolved photoemission spectroscopy (ARPES) for the electron-doped high-temperature superconducting cuprates (HTSCs) Nd2-xCexCCuO4 (x = 0.075 and 0.15) in order to disclose their genuine bulk electronic structures. Our soft x-ray ARPES has revealed that the bulk-derived nodal 'kink' (the abrupt change of the electron velocity in quasiparticle dispersions), being absent in the low-energy ARPES, is clearly observable for the electron-doped superconducting Nd 1.85Ce0.15CuO4. This result confirms that the antiferromagnetic spin correlation is suppressed and the electron-phonon interactions are prevailing in the bulk of the electron-doped superconducting Nd2-xCexCuO4 at the optimal doping level. The nodal 'kink' behavior is equivalent to that observed in the hole-doped HTSCs. The anisotropic strong electron-phonon interactions seem to be inherent in the HTSCs irrespective of the type of doped carriers.

Original languageEnglish
Article number073005
JournalNew Journal of Physics
Volume10
DOIs
Publication statusPublished - 2008 Jul 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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