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 and Stephanie Rosenkranz
Additional contact information
U. Chatterjee: Argonne National Laboratory
J. Zhao: University of Virginia
M. Iavarone: Temple University
R. Di Capua: Temple University
J. P. Castellan: Argonne National Laboratory
G. Karapetrov: Drexel University
C. D. Malliakas: Argonne National Laboratory
M. G. Kanatzidis: Argonne National Laboratory
H. Claus: Argonne National Laboratory
J. P. C. Ruff: Advanced Photon Source, Argonne National Laboratory
F. Weber: Argonne National Laboratory
J. van Wezel: Argonne National Laboratory
J. C. Campuzano: Argonne National Laboratory
R. Osborn: Argonne National Laboratory
M. Randeria: Ohio State University
N. Trivedi: Ohio State University
M. R. Norman: Argonne National Laboratory

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7313

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