EPJ Web of Conferences
Volume 23, 2012Eurasia-Pacific Summer School & Conference on Correlated Electrons
|Number of page(s)||4|
|Published online||07 March 2012|
Identification of Nodal Kink in Electron-Doped (Nd1.85Ce0.15)CuO4 Superconductor from Laser-Based Angle-Resolved Photoemission Spectroscopy
1 National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 Laboratory for Optics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
4 Department of Physics, University of Science and Technology of China, Anhui, China
5 Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama Kanagawa, Japan
a Corresponding author: XJZhou@aphy.iphy.ac.cn
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.
© Owned by the authors, published by EDP Sciences, 2012
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