Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Gabovich, A. M.; Войтенко, А. И.; Ekino, Toshikazu; Li, Mai Suan; Szymczak, H.; Pękała, M.

doi:10.1155/2010/681070

Cited by 64 publications

(115 citation statements)

References 607 publications

(831 reference statements)

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“…For instance, they indicate that the CDW wave vectors conspicuously differ from the values dictated by the FS flat-section separation. This disagreement might be explained by Coulomb correlations (in this sense, the above-mentioned viewpoint is quite reasonable) or the actual three-dimensionality of the FS in high-T c oxides [60]. The distinctions concerned become larger for overdoped samples, as was observed, e.g., in Ca 2−x Na x CuO 2 Cl 2 .…”

Section: Discussionmentioning

confidence: 91%

“…Our models for the s-wave CDWs + s-wave [60,71,73] or d x 2 −y 2 -wave superconductivity [119][120][121] are a generalization of earlier theories [50][51][52]61,64,66,68,69] dealing with the interplay between the isotropic s-wave Cooper pairing and CDWs. Hereafter, we restrict ourselves to the "pure" s-or d x 2 −y 2 -superconductivity bearing in mind that orthorhombic distortions-in particular, for YBa 2 Cu 3 O 7−δ [223]-allow the appearance of a state with a combined s + d order parameter [23,24].…”

Section: Hamiltonianmentioning

confidence: 99%

“…Ion displacements-called periodic lattice distortions (PLDs)-accompanied by electron density modulations (CDWs) [122,123] were observed in almost all high-T c oxides using various direct techniques [50][51][52]56,60,[124][125][126]. Among them one should differentiate between checkerboard superstructures [127][128][129][130][131][132] (these are quite natural for the electron distribution with four-fold rotational symmetry inherent to cuprates with their quasi-two-dimensional CuO 2 planes [93,[133][134][135][136]) and distorted states with broken rotational symmetry, e.g., unidirectional CDWs [129,130,[137][138][139][140] or more disordered nematic configurations [56,124,[141][142][143][144].…”

Section: Cdw and Pseudogap Evidence In Cupratesmentioning

confidence: 99%

“…This review of our theory, partially published elsewhere [60,[119][120][121], and related problems deals with cuprates but it can also be applied to other superconductors with unstable electron spectrum and non-conventional order parameter symmetry. Hereafter, we adopt the already expressed viewpoint that pseudogaps in cuprates are CDW gaps, although other interpretations are respected and mentioned in some places.…”

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confidence: 99%

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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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Section: Discussionmentioning

confidence: 91%

Section: Hamiltonianmentioning

confidence: 99%

Section: Cdw and Pseudogap Evidence In Cupratesmentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…FeSC are perfect systems for realization of the CDW (or SDW) induced superconductivity, the idea which had been suggested long ago [105][106][107] and widely discussed [108][109][110][111]. For a slightly non-stoichiometric system, the band gap cannot kill the FS completely since some extra carriers should form small FS pockets and place the Van Hove singularity (vHs) close to the Fermi level.…”

Section: Magnetic Orderingmentioning

confidence: 99%

Iron-based superconductors: Magnetism, superconductivity, and electronic structure (Review Article)

Kordyuk

2012

Low Temperature Physics

218

155

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Angle resolved photoemission spectroscopy (ARPES) reveals the features of the electronic structure of quasitwo-dimensional crystals, which are crucial for the formation of spin and charge ordering and determine the mechanisms of electron-electron interaction, including the superconducting pairing. The newly discovered ironbased superconductors (FeSC) promise interesting physics that stems, on one hand, from a coexistence of superconductivity and magnetism and, on the other hand, from complex multi-band electronic structure. In this review I want to give a simple introduction to the FeSC physics, and to advocate an opinion that all the complexity of FeSC properties is encapsulated in their electronic structure. For many compounds, this structure was determined in numerous ARPES experiments and agrees reasonably well with the results of band structure calculations. Nevertheless, the existing small differences may help to understand the mechanisms of the magnetic ordering and superconducting pairing in FeSC.

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Terahertz Electrodynamics in Transition Metal Oxides

Prajapati

Dagar

et al. 2019

Advanced Optical Materials

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adom.201900958. 2−y 2 , d z 2 ) levels. [35] The splitting of the d-orbital was successfully explained by the crystal field theory. The ground state properties of these materials are mainly governed by the two interactions; i) the electron correlations (U) and, ii) SOC (λ) in the crystal field split narrow bands. [36] Among d electron systems, electrons in 3d TMOs experiences large electron correlations due to localized nature of 3d orbitals. The idea of electron-electron interaction was given by Sir N. F. Mott in 1949. It originated from the fact that the NiO was expected to be a metal according to the band theory, while the experiments showed insulating behavior. [37][38][39][40][41] This disagreement of experiments with the theory was explained by Hubbard who attributed the insulating state to the splitting

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Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Cited by 64 publications

References 607 publications

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

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

Iron-based superconductors: Magnetism, superconductivity, and electronic structure (Review Article)

Terahertz Electrodynamics in Transition Metal Oxides

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