Discovery of an Unconventional Charge Density Wave at the Surface of K0.9Mo6 O17

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

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14 Scopus citations

Abstract

We use angle resolved photoemission spectroscopy, Raman spectroscopy, low energy electron diffraction, 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 10 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.

Original languageEnglish (US)
Article number196401
JournalPhysical review letters
Volume116
Issue number19
DOIs
StatePublished - May 13 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Mou, D., Sapkota, A., Kung, H. H., Krapivin, V., Wu, Y., Kreyssig, A., Zhou, X., Goldman, A. I., Blumberg, G., Flint, R., & Kaminski, A. (2016). Discovery of an Unconventional Charge Density Wave at the Surface of K0.9Mo6 O17. Physical review letters, 116(19), [196401]. https://doi.org/10.1103/PhysRevLett.116.196401