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

U. Chatterjee; J. Zhao; M. Iavarone; R. Di Capua; J. P. Castellan; G. Karapetrov; C. D. Malliakas; M. G. Kanatzidis; H. Claus; J. P.C. Ruff; F. Weber; J. Van Wezel; J. C. Campuzano; R. Osborn; M. Randeria; N. Trivedi; M. R. Norman; S. Rosenkranz

doi:10.1038/ncomms7313

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

U. Chatterjee, J. Zhao, M. Iavarone, R. Di Capua, J. P. Castellan, G. Karapetrov, C. D. Malliakas, M. G. Kanatzidis, H. Claus, J. P.C. Ruff, F. Weber, J. Van Wezel, J. C. Campuzano, R. Osborn, M. Randeria, N. Trivedi, M. R. Norman, S. Rosenkranz

Northwestern University

Research output: Contribution to journal › Article

50 Citations (Scopus)

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 T_cdw. 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 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.

Original language	English
Article number	6313
Journal	Nature communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms7313
Publication status	Published - Feb 17 2015

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ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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Chatterjee, U., Zhao, J., Iavarone, M., Di Capua, R., Castellan, J. P., Karapetrov, G., Malliakas, C. D., Kanatzidis, M. 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. (2015). Emergence of coherence in the charge-density wave state of 2H-NbSe₂. Nature communications, 6, [6313]. https://doi.org/10.1038/ncomms7313

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, M. 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

Chatterjee, U, Zhao, 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 2015, 'Emergence of coherence in the charge-density wave state of 2H-NbSe₂', Nature communications, vol. 6, 6313. https://doi.org/10.1038/ncomms7313

Chatterjee, U. ; Zhao, J. ; Iavarone, M. ; Di Capua, R. ; Castellan, J. P. ; Karapetrov, G. ; Malliakas, C. D. ; Kanatzidis, M. 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. / Emergence of coherence in the charge-density wave state of 2H-NbSe₂. In: Nature communications. 2015 ; Vol. 6.

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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.",

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AU - Karapetrov, G.

AU - Malliakas, C. D.

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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.

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