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Discovery of an Unconventional Charge Density Wave at the Surface of K0.9Mo6O17

TitleDiscovery of an Unconventional Charge Density Wave at the Surface of K0.9Mo6O17
Publication TypeJournal Article
Year of Publication2016
AuthorsMou, DX, Sapkota, A, Kung, HH, Krapivin, V, Wu, Y, Kreyssig, A, Zhou, XJ, Goldman, AI, Blumberg, G, Flint, R, Kaminski, A
JournalPhysical Review Letters
Date Published05
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000376014500004
Keywordsbi2sr2cacu2o8+delta, connection, dependent superconductivity, instability, order, physics, potassium, purple bronze k0.9mo6o17, raman-scattering, t-c, transition-metal dichalcogenides

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 T-S_CDW = 220 K nearly twice that of the bulk CDW, T-B_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.

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Alternate JournalPhys. Rev. Lett.