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Journal article
Emergence of coherence in the charge-density wave state of 2H-NbSe2
Nature communications, v 6(1), pp 6313-6313
17 Feb 2015
PMID: 25687135
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.
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Details
- Title
- Emergence of coherence in the charge-density wave state of 2H-NbSe2
- Creators
- U Chatterjee - Argonne National LaboratoryJ Zhao - 1] Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA [2] Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA.M Iavarone - Temple UniversityR Di Capua - Temple UniversityJ P Castellan - Applied MaterialsG Karapetrov - Drexel UniversityC D Malliakas - Argonne National LaboratoryM G Kanatzidis - Argonne National LaboratoryH Claus - Argonne National LaboratoryJ P C Ruff - 1] Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA CHESS, Cornell University, Ithaca, New York 14853, USAF Weber - Applied MaterialsJ van Wezel - Argonne National LaboratoryJ C Campuzano - Argonne National LaboratoryR Osborn - Argonne National LaboratoryM Randeria - The Ohio State UniversityN Trivedi - The Ohio State UniversityM R Norman - Argonne National LaboratoryS Rosenkranz - Argonne National LaboratoryUniv. of Texas, Austin, TX (United States)
- Publication Details
- Nature communications, v 6(1), pp 6313-6313
- Publisher
- Springer Nature
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000350290300011
- Scopus ID
- 2-s2.0-84923333369
- Other Identifier
- 991019168745904721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Multidisciplinary