Abstract
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.
| Original language | English |
|---|---|
| Article number | 6313 |
| Journal | Nature Communications |
| Volume | 6 |
| DOIs | |
| Publication status | Published - Feb 17 2015 |
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ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Chemistry(all)
- Physics and Astronomy(all)
Cite this
Emergence of coherence in the charge-density wave state of 2H-NbSe2. / Chatterjee, U.; Zhao, J.; Iavarone, M.; Di Capua, R.; Castellan, J. P.; Karapetrov, G.; Malliakas, C. D.; Kanatzidis, Mercouri G; Claus, H.; Ruff, J. P C; Weber, F.; Van Wezel, J.; Campuzano, J. C.; Osborn, R.; Randeria, M.; Trivedi, N.; Norman, M. R.; Rosenkranz, S.
In: Nature Communications, Vol. 6, 6313, 17.02.2015.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Emergence of coherence in the charge-density wave state of 2H-NbSe2
AU - Chatterjee, U.
AU - Zhao, J.
AU - Iavarone, M.
AU - Di Capua, R.
AU - Castellan, J. P.
AU - Karapetrov, G.
AU - Malliakas, C. D.
AU - Kanatzidis, Mercouri G
AU - Claus, H.
AU - Ruff, J. P C
AU - Weber, F.
AU - Van Wezel, J.
AU - Campuzano, J. C.
AU - Osborn, R.
AU - Randeria, M.
AU - Trivedi, N.
AU - Norman, M. R.
AU - Rosenkranz, S.
PY - 2015/2/17
Y1 - 2015/2/17
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84923333369&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84923333369&partnerID=8YFLogxK
U2 - 10.1038/ncomms7313
DO - 10.1038/ncomms7313
M3 - Article
AN - SCOPUS:84923333369
VL - 6
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 6313
ER -