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arXiv 0808.1809cond-mat.supr-con
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铁基高$T_c$超导体中轨道选择性电子模耦合的观测

Observation of an Orbital Selective Electron-Mode Coupling in Fe-Based High-$T_c$ Superconductors

P. Richard, T. Sato, K. Nakayama, S. Souma, T. Takahashi, Y. -M. Xu, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding

摘要:

我们对新超导体Ba $_{0.6}$ K $_{0.4}$ Fe $_2$ As $_2$在低能区进行了角分辨光电子能谱研究。我们报道了在超导Ba $_{0.6}$ K $_{0.4}$ Fe $_2$ As $_2$样品中观察到的25 meV附近的色散异常,该异常在$T_c$以上几乎消失。相关模式的能量标度(13 $\pm$ 2 meV)及其对轨道和温度的强烈依赖性表明它不太可能与声子有关。此外,扭结的动量位置可以通过反铁磁波矢连接。我们的结果指出了铁基超导体中的模式和超导配对的非常规电子起源,并强烈支持反相s波配对对称性。

英文摘要:

We have performed an angle-resolved photoemission spectroscopy study of the new superconductor Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ in the low energy range. We report the observation of an anomaly around 25 meV in the dispersion of superconducting Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ samples that nearly vanishes above $T_c$. The energy scale of the related mode (13$\pm$2 meV) and its strong dependence on orbital and temperature indicates that it is unlikely related to phonons. Moreover, the momentum locations of the kink can be connected by the antiferromagnetic wavevector. Our results point towards an unconventional electronic origin of the mode and the superconducting pairing in the Fe-based superconductors, and strongly support the anti-phase s-wave pairing symmetry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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