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arXiv 0909.1136cond-mat.supr-concond-mat.str-el
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电子掺杂铜氧化物隧穿谱中的精细结构:与磁共振模无耦合

Fine structure in the tunneling spectra of electron-doped cuprates: No coupling to magnetic resonance mode

Guo-meng Zhao

摘要:

分析了电子掺杂的Pr0.88LaCe0.12CuO4(Tc = 24 K)的高分辨扫描隧道谱。我们发现,低于35毫电子伏的光谱精细结构是一致的,在16毫电子伏的玻色子模式的强耦合,在定量协议与早期的Nd1.85Ce0.15CuO4的隧穿光谱。由于玻色子模的能量明显高于非弹性中子散射所观察到的类磁共振模的能量(9.5-11 meV),因此在16 meV处的耦合特征不能来自与磁模的强耦合。因此,目前的工作表明,磁共振类模式不能在电子掺杂的铜氧化物的高温超导性的起源。

英文摘要:

We analyze high-resolution scanning tunneling spectra of the electron-doped cuprate Pr0.88LaCe0.12CuO4 (T_c = 24 K). We find that the spectral fine structure below 35 meV is consistent with strong coupling to a bosonic mode at 16 meV, in quantitative agreement with early tunneling spectra of Nd1.85Ce0.15CuO4. Since the energy of the bosonic mode is significantly higher than that (9.5-11 meV) of the magnetic resonance-like mode observed by inelastic neutron scattering, the coupling feature at 16 meV cannot arise from strong coupling to the magnetic mode. The present work thus demonstrates that the magnetic resonance-like mode cannot be the origin of high-temperature superconductivity in electron-doped cuprates.

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