EPJ Web of Conferences (Mar 2012)

Identification of Nodal Kink in Electron-Doped (Nd1.85Ce0.15)CuO4 Superconductor from Laser-Based Angle-Resolved Photoemission Spectroscopy

  • Zhou X. J.,
  • Chen Chuangtian,
  • Sasagawa T.,
  • Xu Zuyan,
  • Chen Xianhui,
  • Wang Xiaoyang,
  • Wu Tao,
  • Zhu Yong,
  • Zhou Yong,
  • Wang Guiling,
  • Lu Wei,
  • Dong Xiaoli,
  • Jia Xiaowen,
  • Meng Jianqiao,
  • Zhao Lin,
  • Zhang Wentao,
  • Liu Guodong,
  • Liu Haiyun

DOI
https://doi.org/10.1051/epjconf/20122300005
Journal volume & issue
Vol. 23
p. 00005

Abstract

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High-resolution laser-based angle-resolved photoemission measurements have been carried out on the electron-doped (Nd1.85Ce0.15)CuO4 high temperature superconductor. We have revealed a clear kink at ~60 meV in the dispersion along the (0,0)–(π,π) nodal direction, accompanied by a peak-dip-hump feature in the photoemission spectra. This indicates that the nodal electrons are coupled to collective excitations (bosons) in electron-doped superconductors, with the phonons as the most likely candidate of the boson. This finding has established a universality of nodal electron coupling in both hole- and electron-doped high temperature cuprate superconductors.