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

Abstract

In this study, 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.

Authors:
 [1];  [1];  [2];  [2];  [1];  [1];  [3];  [1];  [4];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Rutgers Univ., Piscataway, NJ (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Rutgers Univ., Piscataway, NJ (United States); National Institute of Chemical Physics and Biophysics, Tallinn (Estonia)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1257368
Alternate Identifier(s):
OSTI ID: 1253068
Report Number(s):
IS-J-8897
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
AC02-06CH11357; NSF DMR-1104884; AC02-07CH11358; SC0005463
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 19; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Mou, Daixiang, Sapkota, Aashish, Kung, H. -H., Krapivin, Viktor, Wu, Yun, Kreyssig, A., Zhou, Xingjiang, Goldman, A. I., Blumberg, G., Flint, Rebecca, and Kaminski, Adam. Discovery of an unconventional charge density wave at the surface of K0.9Mo6O17. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.116.196401.
Mou, Daixiang, Sapkota, Aashish, Kung, H. -H., Krapivin, Viktor, Wu, Yun, Kreyssig, A., Zhou, Xingjiang, Goldman, A. I., Blumberg, G., Flint, Rebecca, & Kaminski, Adam. Discovery of an unconventional charge density wave at the surface of K0.9Mo6O17. United States. doi:10.1103/PhysRevLett.116.196401.
Mou, Daixiang, Sapkota, Aashish, Kung, H. -H., Krapivin, Viktor, Wu, Yun, Kreyssig, A., Zhou, Xingjiang, Goldman, A. I., Blumberg, G., Flint, Rebecca, and Kaminski, Adam. Fri . "Discovery of an unconventional charge density wave at the surface of K0.9Mo6O17". United States. doi:10.1103/PhysRevLett.116.196401. https://www.osti.gov/servlets/purl/1257368.
@article{osti_1257368,
title = {Discovery of an unconventional charge density wave at the surface of K0.9Mo6O17},
author = {Mou, Daixiang and Sapkota, Aashish and Kung, H. -H. and Krapivin, Viktor and Wu, Yun and Kreyssig, A. and Zhou, Xingjiang and Goldman, A. I. and Blumberg, G. and Flint, Rebecca and Kaminski, Adam},
abstractNote = {In this study, 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.},
doi = {10.1103/PhysRevLett.116.196401},
journal = {Physical Review Letters},
number = 19,
volume = 116,
place = {United States},
year = {2016},
month = {5}
}

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