Department of Physics and Astronomy, California State University, Los Angeles, California 90032, USA.
Phys Rev Lett. 2009 Dec 4;103(23):236403. doi: 10.1103/PhysRevLett.103.236403.
We reanalyze high-resolution scanning tunneling spectra of the electron-doped cuprate Pr(0.88)LaCe(0.12)CuO(4) (T(c) = 24 K). We find that the spectral fine structure below 35 meV is consistent with strong coupling to a bosonic mode at about 16 meV, in quantitative agreement with early tunneling spectra of Nd(1.85)Ce(0.15)CuO(4). Since the energy of the bosonic mode is significantly higher than that (9.5-11 meV) of the magnetic resonancelike mode observed by inelastic neutron scattering, the coupling feature at about 16 meV cannot arise from strong coupling to the magnetic mode. The present work thus demonstrates that the magnetic resonancelike mode cannot be the origin of high-temperature superconductivity in electron-doped cuprates.
我们重新分析了电子掺杂 cuprate Pr(0.88)LaCe(0.12)CuO(4)（T(c)=24 K）的高分辨率扫描隧道谱。我们发现，低于 35 meV 的谱精细结构与约 16 meV 的玻色模式的强耦合一致，与 Nd(1.85)Ce(0.15)CuO(4)的早期隧道谱定量相符。由于玻色模式的能量明显高于弹性中子散射观测到的类磁共振模式（9.5-11 meV），因此，约 16 meV 的耦合特征不可能来自于对磁模式的强耦合。本工作因此表明，类磁共振模式不可能是电子掺杂 cuprate 高温超导的起源。
