Emergence of coherence in the charge-density wave state of 2H-NbSe<inf>2</inf>
Genre
Journal ArticleDate
2015-02-17Author
Chatterjee, UZhao, J
Iavarone, M
Di Capua, R
Castellan, JP
Karapetrov, G
Malliakas, CD
Kanatzidis, MG
Claus, H
Ruff, JPC
Weber, F
Van Wezel, J
Campuzano, JC
Osborn, R
Randeria, M
Trivedi, N
Norman, MR
Rosenkranz, S
Permanent link to this record
http://hdl.handle.net/20.500.12613/5239
Metadata
Show full item recordDOI
10.1038/ncomms7313Abstract
© 2015 Macmillan Publishers Limited. All rights reserved. A charge-density wave (CDW) state has a broken symmetry described by a complex order parameter with an amplitude and a phase. The conventional view, based on clean, weak-coupling systems, is that a finite amplitude and long-range phase coherence set in simultaneously at the CDW transition temperature Tcdw. Here we investigate, using photoemission, X-ray scattering and scanning tunnelling microscopy, the canonical CDW compound 2H-NbSe2 intercalated with Mn and Co, and show that the conventional view is untenable. We find that, either at high temperature or at large intercalation, CDW order becomes short-ranged with a well-defined amplitude, which has impacts on the electronic dispersion, giving rise to an energy gap. The phase transition at Tcdw marks the onset of long-range order with global phase coherence, leading to sharp electronic excitations. Our observations emphasize the importance of phase fluctuations in strongly coupled CDW systems and provide insights into the significance of phase incoherence in 'pseudogap' states.Citation to related work
Springer Science and Business Media LLCHas part
Nature CommunicationsADA compliance
For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.eduae974a485f413a2113503eed53cd6c53
http://dx.doi.org/10.34944/dspace/5221