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Emergence of coherence in the charge-density wave state of 2H-NbSe₂

Chatterjee, U.; Zhao, J.; Iavarone, M.; Di Capua, R.; Castellan, J. P. 1; Karapetrov, G.; Malliakas, C. D.; Kanatzidis, M. G.; Claus, H.; Ruff, J. P. C.; Weber, F. ORCID iD icon 2; Wezel, J. van; Campuzano, J. C.; Osborn, R.; Randeria, M.; Trivedi, N.; Norman, M. R.; Rosenkranz, S.
1 Institut für Festkörperphysik (IFP), Karlsruher Institut für Technologie (KIT)
2 Karlsruher Institut für Technologie (KIT)


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 T$_{CDW}$. Here we investigate, using photoemission, X-ray scattering and scanning tunnelling microscopy, the canonical CDW compound 2H-NbSe$_{2}$ 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 T$_{CDW}$ 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.

Volltext §
DOI: 10.5445/IR/110099994
DOI: 10.1038/ncomms7313
Zitationen: 122
Zitationen: 137
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 110099994
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Nature Communications
Verlag Nature Research
Band 6
Seiten 6313
Nachgewiesen in Web of Science
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