Hidden Fermi Surface Nesting and Charge Density Wave Instability in Low-Dimensional Metals

Whangbo, Myung Hwan; Canadell, Enric; Foury, P.; Pouget, Jean‐Paul

doi:10.1126/science.252.5002.96

Cited by 220 publications

(187 citation statements)

References 19 publications

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“…6a) with the stripe periodicity provides strong evidence that this is a CDW gap associated with the depletion of states around the Fermi level. The near-perfect inversion of contrast with bias polarity seen in Figure 4 is also characteristic of a true CDW 34 . The large gap size indicates a significant modification of the FS, but is consistent with that seen in other lamellar materials.…”

Section: Discussionmentioning

confidence: 69%

Charge density waves in the graphene sheets of the superconductor CaC6

et al. 2011

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Graphitic systems have an electronic structure that can be readily manipulated through electrostatic or chemical doping, resulting in a rich variety of electronic ground states. Here we report the first observation and characterization of electronic stripes in the highly electrondoped graphitic superconductor, CaC 6 , by scanning tunnelling microscopy and spectroscopy. The stripes correspond to a charge density wave with a period three times that of the Ca superlattice. Although the positions of the Ca intercalants are modulated, no displacements of the carbon lattice are detected, indicating that the graphene sheets host the ideal charge density wave. This provides an exceptionally simple material-graphene-as a starting point for understanding the relation between stripes and superconductivity. Furthermore, our experiments suggest a strategy to search for superconductivity in graphene, namely in the vicinity of striped 'Wigner crystal' phases, where some of the electrons crystallize to form a superlattice.

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Section: Discussionmentioning

confidence: 69%

Charge density waves in the graphene sheets of the superconductor CaC6

et al. 2011

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“…The extent of pockets should be limited in (q x ,q y ) plane in order to moderate blurring of the nesting construction; it should be also limited in q z direction, otherwise I-centering of the resulting pattern would be suppressed and disappear completely if a pocket transforms to a thin tube. In fact, even so-called "hidden" nesting [28], without a formation of real pocket, may be sufficient. We conclude with a note on a bulk character of all our observations.…”

Section: Discussionmentioning

confidence: 99%

Phase coexistence in Cs0.8Fe1.6Se2as seen by x-ray mapping of re

et al. 2012

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Fourfold splitting of the rods as well as the main Bragg peaks for L≠0 imply that symmetry of the minor phase is not higher than monoclinic. The monoclinic distortion was estimated to be 90.7 degrees. Structured diffuse scattering, observed on top of the Bragg component, relates to the major phase and is attributed to a correlated distribution of Cs ions. Elastic nature of the observed scattering was confirmed by additional inelastic X-ray scattering experiment.Diffuse scattering forms 3D objects that have topological similarity with what one would expect, under assumptions discussed in the text, for a Fermi surface nesting.

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“…At the same time, the nesting character of the FS preserves, thus reflecting the incipient instability overcome by Coulomb scatterers. Nevertheless, to be sincere, it should be indicated that nesting is only a necessary condition (the so-called "hidden nesting" [279] may be considered as a property closely resembling the true nesting) of the CDW ordering to take place rather than the sufficient one. Certain relevant speculations describing opposite views can be found in References [280][281][282].…”

Section: Discussionmentioning

confidence: 99%

d-Wave Superconductivity and s-Wave Charge Density Waves: Coexistence between Order Parameters of Different Origin and Symmetry

Ekino

Gabovich

et al. 2011

Symmetry

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A review of the theory describing the coexistence between d-wave superconductivity and s-wave charge-density-waves (CDWs) is presented. The CDW gapping is identified with pseudogapping observed in high-T c oxides. According to the cuprate specificity, the analysis is carried out for the two-dimensional geometry of the Fermi surface (FS). Phase diagrams on the σ 0 − α plane-here, σ 0 is the ratio between the energy gaps in the parent pure CDW and superconducting states, and the quantity 2α is connected with the degree of dielectric (CDW) FS gapping-were obtained for various possible configurations of the order parameters in the momentum space. Relevant tunnel and photoemission experimental data for high-T c oxides are compared with theoretical predictions. A brief review of the results obtained earlier for the coexistence between s-wave superconductivity and CDWs is also given.

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Hidden Fermi Surface Nesting and Charge Density Wave Instability in Low-Dimensional Metals

Cited by 220 publications

References 19 publications

Charge density waves in the graphene sheets of the superconductor CaC6

Charge density waves in the graphene sheets of the superconductor CaC6

Phase coexistence in Cs0.8Fe1.6Se2as seen by x-ray mapping of re

d-Wave Superconductivity and s-Wave Charge Density Waves: Coexistence between Order Parameters of Different Origin and Symmetry

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