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

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.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1391659
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Communications; Journal Volume: 6
Country of Publication:
United States
Language:
English

Citation Formats

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., and Rosenkranz, S. Emergence of coherence in the charge-density wave state of 2H-NbSe2. United States: N. p., 2015. Web. doi: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. United States. doi: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., and Rosenkranz, S. Tue . "Emergence of coherence in the charge-density wave state of 2H-NbSe2". United States. doi:10.1038/ncomms7313.
@article{osti_1391659,
title = {Emergence of coherence in the charge-density wave state of 2H-NbSe2},
author = {Chatterjee, U. and Zhao, J. and Iavarone, M. and Di Capua, R. and Castellan, J. P. and Karapetrov, G. and Malliakas, C. D. and Kanatzidis, M. G. and Claus, H. and Ruff, J. P. C. and Weber, F. and van Wezel, J. and Campuzano, J. C. and Osborn, R. and Randeria, M. and Trivedi, N. and Norman, M. R. and Rosenkranz, S.},
abstractNote = {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.},
doi = {10.1038/ncomms7313},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {Tue Feb 17 00:00:00 EST 2015},
month = {Tue Feb 17 00:00:00 EST 2015}
}