Document Type

Dataset

Dataset Type

numeric_data

Dataset Product Numbers

none

DEO Contract Number

DE-AC02-07CH11358

Originating Research Organization

Ames Laboratory (AMES), Ames, IA (United States)

Publication/Issue Date

2016

Language

English

Country of Publication

US

Sponsoring Organization(s)

SC-22 USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Subject Categories

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Abstract

We use Angle Resolved Photoemission Spectroscopy (ARPES), Raman spectroscopy, Low Energy Electron Diffraction (LEED) and x-ray scattering to reveal an unusual electronically mediated charge density wave (CDW) in K$_{0.9}$Mo$_6$O$_{17}$. Not only does K$_{0.9}$Mo$_6$O$_{17}$ 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 ten 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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.rar

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