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

Daixiang Mou, A. Sapkota, H.-H. Kung, Viktor Krapivin, Yun Wu, A. Kreyssig, Xingjiang Zhou, A. I. Goldman, G. Blumberg, Rebecca Flint, and Adam Kaminski
Phys. Rev. Lett. 116, 196401 – Published 13 May 2016
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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=220K nearly twice that of the bulk CDW, TB_CDW=115K. 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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  • Received 8 January 2016

DOI:https://doi.org/10.1103/PhysRevLett.116.196401

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Daixiang Mou1,2,*, A. Sapkota1,2, H.-H. Kung3, Viktor Krapivin3, Yun Wu1,2, A. Kreyssig1,2, Xingjiang Zhou4, A. I. Goldman1,2, G. Blumberg3,5, Rebecca Flint1,2, and Adam Kaminski1,2,†

  • 1Division of Materials Science and Engineering, Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 3Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
  • 4National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 5National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia

  • *moudaixiang@gmail.com
  • kaminski@ameslab.gov

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Issue

Vol. 116, Iss. 19 — 13 May 2016

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