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

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

doi:10.1103/PhysRevLett.116.196401

Title: Discovery of an unconventional charge density wave at the surface of K_0.9Mo₆O₁₇

Journal Article · Fri May 13 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.196401· OSTI ID:1257368

Mou, Daixiang ^[1]; Sapkota, Aashish ^[1]; Kung, H. -H. ^[2]; Krapivin, Viktor ^[2]; Wu, Yun ^[1]; Kreyssig, A. ^[1]; Zhou, Xingjiang ^[3]; Goldman, A. I. ^[1]; Blumberg, G. ^[4]; Flint, Rebecca ^[1]; Kaminski, Adam ^[1]

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)

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 K_0.9Mo₆O₁₇. Not only does K_0.9Mo₆O₁₇ 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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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; NSF DMR-1104884; AC02-07CH11358; SC0005463

OSTI ID:: 1257368

Alternate ID(s):: OSTI ID: 1253068

Report Number(s):: IS-J-8897; PRLTAO

Journal Information:: Physical Review Letters, Vol. 116, Issue 19; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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