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.

doi:10.1038/ncomms7313

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

Journal Article · Tue Feb 17 00:00:00 EST 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms7313· OSTI ID:1219582

Chatterjee, U. ^[1]; Zhao, J. ^[2]; Iavarone, M. ^[3]; Di Capua, R. ^[3]; Castellan, J. P. ^[4]; Karapetrov, G. ^[5]; Malliakas, C. D. ^[6]; Kanatzidis, M. G. ^[6]; Claus, H. ^[7]; Ruff, J. P. C. ^[8]; Weber, F. ^[4];

^[9]; Campuzano, J. C. ^[10];

^[7]; Randeria, M. ^[11]; Trivedi, N. ^[11]; Norman, M. R. ^[7];

^[7]

Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Virginia, Charlottesville, VA (United States)
Univ. of Virginia, Charlottesville, VA (United States); Univ. of Illinois, Chicago, IL (United States)
Temple Univ., Philadelphia, PA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Karlsruhe Inst. of Technology (Germany)
Drexel Univ., Philadelphia, PA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Cornell Univ., Ithaca, NY (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Amsterdam (Netherlands)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Illinois, Chicago, IL (United Sates)
The Ohio State Univ., Columbus, OH (United States)

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 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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Research Organization:: Temple Univ., Philadelphia, PA (United States); The Ohio State Univ., Columbus, OH (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for the Computational Design of Functional Layered Materials (CCDM); Energy Frontier Research Centers (EFRC) (United States). Center for Complex Materials from First Principles (CCM); Univ. of Texas, Austin, TX (United States); Argonne National Laboratory (ANL), Argonne, IL (United States

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Netherlands Organization for Scientific Research (NWO) (Netherlands)

Grant/Contract Number:: SC0012575; SC0005035; FG02-07ER46423; AC02-06CH11357

OSTI ID:: 1219582

Alternate ID(s):: OSTI ID: 1210744; OSTI ID: 1356631

Journal Information:: Nature Communications, Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 113 works

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