Physics – Condensed Matter – Superconductivity
Scientific paper
2008-08-06
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures
Scientific paper
High-resolution laser-based angle-resolved photoemission measurements have been carried out on the electron-doped (Nd$_{1.85}$Ce$_{0.15}$)CuO$_4$ high temperature superconductor. We have revealed a clear kink at $\sim$60 meV in the dispersion along the (0,0)-($\pi$,$\pi$) 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.
Chen Chuangtian
Chen Xianhui
Dong Xiaoli
Jia Xiaowen
Liu Guodong
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