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arXiv 1601.02040cond-mat.str-el
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K0.9 Mo 6 O 17表面非常规电荷密度波的发现

Discovery of unconventional charge density wave at the surface of K0.9Mo6O17

Daixiang Mou, Aashish Sapkota, H. -H. Kung, Viktor Krapivin, Yun Wu, A. Kreyssig, Xingjiang Zhou, A. I. Goldman, G. Blumberg, Rebecca Flint, Adam Kaminski

摘要:

我们使用角分辨光电子能谱(ARPES),拉曼光谱,低能电子衍射(LEED)和X射线散射,揭示了一个不寻常的电子介导的电荷密度波(CDW)在K0.9Mo6O 17。K_(0.9)Mo_(6 O)_(17)不仅没有电子-声子耦合的特征,而且还具有特殊的表面CDW,TS CDW =220 K几乎是体CDW的两倍,TB CDW =115 K。虽然体CDW具有12 meV的BCS样间隙,但表面间隙大十倍,并且在强耦合区中良好。强耦合行为结合强电子-声子耦合的签名的情况下表明,CDW可能是介导的电子相互作用增强的低维。

英文摘要:

We use Angle Resolved Photoemission Spectroscopy (ARPES), Raman spectroscopy, Low Energy Electron Diffraction (LEED) and x-ray scattering to reveal an unusual electronically mediated charge density wave (CDW) in K0.9Mo6O17. Not only does K0.9Mo6O17 lack signatures of electron-phonon coupling, but it also hosts an extraordinary surface CDW, with TS CDW =220 K nearly twice that of the bulk CDW, TB CDW =115 K. While the bulk CDW has a BCS-like gap of 12 meV, the surface gap is ten times larger and well in the strong coupling regime. Strong coupling behavior combined with the absence of signatures of strong electron-phonon coupling indicates that the CDW is likely mediated by electronic interactions enhanced by low dimensionality.

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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