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

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-NbSe 2 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. As a result, 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:
 [1];  [2];  [3];  [3];  [4];  [5];  [6];  [6];  [7];  [8];  [4]; ORCiD logo [9];  [10]; ORCiD logo [7];  [11];  [11];  [7]; ORCiD logo [7]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Virginia, Charlottesville, VA (United States)
  2. Univ. of Virginia, Charlottesville, VA (United States); Univ. of Illinois, Chicago, IL (United States)
  3. Temple Univ., Philadelphia, PA (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Karlsruhe Inst. of Technology (Germany)
  5. Drexel Univ., Philadelphia, PA (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
  7. Argonne National Lab. (ANL), Argonne, IL (United States)
  8. Argonne National Lab. (ANL), Argonne, IL (United States); Cornell Univ., Ithaca, NY (United States)
  9. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Amsterdam (Netherlands)
  10. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Illinois, Chicago, IL (United States)
  11. The Ohio State Univ., Columbus, OH (United States)
Publication Date:
Research Org.:
Univ. of Texas, Austin, TX (United States); Argonne National Laboratory (ANL), Argonne, IL (United States; Temple Univ., Philadelphia, PA (United States); The Ohio State Univ., Columbus, OH (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Netherlands Organization for Scientific Research (NWO) (Netherlands)
OSTI Identifier:
1219582
Alternate Identifier(s):
OSTI ID: 1210744; OSTI ID: 1356631
Grant/Contract Number:
SC0012575; SC0005035; FG02-07ER46423; AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Related Information: CCDM partners with Temple University (lead); Brookhaven National Laboratory; Drexel University; Duke University; North Carolina State University; Northeastern University; Princeton University; Rice University; University of Pennsylvania; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; catalysis (heterogeneous); solar (photovoltaic); energy storage (including batteries and capacitors); hydrogen and fuel cells; defects; mechanical behavior; materials and chemistry by design; synthesis (novel materials); 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

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. https://www.osti.gov/servlets/purl/1219582.
@article{osti_1219582,
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 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. As a result, 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}
}

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  • 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-NbSe 2 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 impactsmore » 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. As a result, 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.« less
  • Superconducting T/sub c/ can be increased by a low concentration, less than 1%, of irradiation-induced defects in the layered charge-density-wave (CDW) compounds 2H-NbSe/sub 2/, 2H-TaS/sub 2/, and 2H-TaSe/sub 2/. This is due to the pinning effect of the defects which perturbs the long-range coherence of the CDW. Resistive transitions show tails below a first drop, suggesting inhomogeneous superconductivity. Such effects are proposed to be related to CDW domains.
  • 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 themore » 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.« less
  • 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 tunneling 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- range with a well-defined amplitude that impacts themore » 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.« less