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:
-
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Rutgers Univ., Piscataway, NJ (United States)
- Chinese Academy of Sciences (CAS), Beijing (China)
- 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)
- 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. https://doi.org/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. https://doi.org/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 = {Fri May 13 00:00:00 EDT 2016},
month = {Fri May 13 00:00:00 EDT 2016}
}
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