M Tsunekawa et al 2008 New J. Phys. 10 073005 doi:10.1088/1367-2630/10/7/073005
Bulk electronic structures and strong electron–phonon interactions in an electron-doped high-temperature superconductor
M Tsunekawa1,4,5, A Sekiyama1, S Kasai1, S Imada1, H Fujiwara1, T Muro2, Y Onose3, Y Tokura3 and S Suga1
Show affiliationsWe have performed soft x-ray angle-resolved photoemission spectroscopy (ARPES) for the electron-doped high-temperature superconducting cuprates (HTSCs) Nd2-xCexCuO4 (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 Nd1.85Ce0.15CuO4. 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.
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Issue 7 (July 2008)
Received 4 October 2007
Published 1 July 2008
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Bulk electronic structures and strong electron–phonon interactions in an electron-doped high-temperature superconductor
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