Optical model-solution to the competition between a pseudogap phase and a charge-transfer-gap phase in high-temperature cuprate superconductors

Das, Tanmoy; Markiewicz, R. S.; Bansil, Arun

doi:10.1103/physrevb.81.174504

Cited by 39 publications

(22 citation statements)

References 67 publications

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“…A similar intermediate coupling theory has been successful in describing many saliant features in cuprates. 41,42 Recently, we became aware of the works by Wang et al 40 and Maier et al 43 which also predicted the d-wave gap in FeSe based systems.…”

Section: Discussionmentioning

confidence: 99%

Stripes, spin resonance, and nodelessd-wave pairing symmetry in Fe2Se2-based layered superconductors

Das

Balatsky

2011

Phys. Rev. B

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We calculate RPA-BCS-based spin resonance spectra of the newly discovered iron-selenide superconductor by using the two-orbital tight-binding model in a 1-Fe-unit cell. The slightly squarish electron pocket Fermi surfaces at (π,0)/(0,π ) momenta produce leading interpocket nesting instability at incommensurate vector q ∼ (π,0.5π ) in the normal-state static susceptibility, pinning a strong stripe-like spin-density wave or antiferromagnetic order at some critical value of U . The same nesting also induces d x 2 −y 2 pairing in a 1-Fe-unit cell. The superconducting gap is nodeless and isotropic on the Fermi surfaces, as they lie concentric to the fourfold symmetric point of the d-wave gap maxima, in agreement with various experiments. This produces a slightly incommensurate spin resonance with upward dispersion, in close agreement with neutron data on chalcogenides. Finally, we demonstrate the conversion procedure from a 1-Fe-unit cell to a 2-Fe-unit cell in which the gap symmetry transformed simultaneously into a d xy pairing and the resulting resonance spectrum moves from the q (π,π) to the q (2π,0)/(2π,0) region.

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Section: Discussionmentioning

confidence: 99%

Stripes, spin resonance, and nodelessd-wave pairing symmetry in Fe2Se2-based layered superconductors

Das

Balatsky

2011

Phys. Rev. B

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“…However, λ has a strong momentum dependence, for instance, the nodal value is considerably smaller: in LSCO, λ nodal = 0.14-0.22 at optimal doping, and 0.14-0.20 in the overdoped regime [39]. Since nodal electrons dominate transport [16], this accounts for the smaller λʼs estimated from transport measurements. Further, several calculations suggest that correlation effects can enhance the anisotropy of electron-phonon coupling, generally leading to a larger value for AN nesting [28,[43][44][45].…”

Section: Model and Formalismmentioning

confidence: 99%

“…We adopt an intermediate coupling approach in our analysis in this study [13]. This is justified by recent studies [14][15][16][17][18][19], which have indicated that correlations in the cuprates are not as strong as initially believed, and that cuprates fall, instead, in an intermediate coupling regime, with ⩽ ⩽ U t 6 9 , where U is the effective Hubbard interaction and t is the nearest-neighbor hopping parameter. We have shown [13] that intermediate coupling corresponds approximately to ⩽ ⩽ = U t U t 4 13.6 BR , where U BR is the mean-field Brinkman-Rice energy signaling the transition to the Mott insulating state [15,20].…”

Section: Introductionmentioning

confidence: 98%

Gutzwiller charge phase diagram of cuprates, including electron–phonon coupling effects

et al. 2015

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Besides significant electronic correlations, high-temperature superconductors also show a strong coupling of electrons to a number of lattice modes. Combined with the experimental detection of electronic inhomogeneities and ordering phenomena in many high-T c compounds, these features raise the question as to what extent phonons are involved in the associated instabilities. Here we address this problem based on the Hubbard model including a coupling to phonons in order to capture several salient features of the phase diagram of hole-doped cuprates. Charge degrees of freedom, which are suppressed by the large Hubbard U near half-filling, are found to become active at a fairly low doping level. We find that possible charge order is mainly driven by Fermi surface nesting, with competition between a near-π π ( , )order at low doping and antinodal nesting at higher doping, very similar to the momentum structure of magnetic fluctuations. The resulting nesting vectors are generally consistent with photoemission and tunneling observations, evidence for charge density wave order in YBa 2 Cu 3 O δ − 7including Kohn anomalies, and suggestions of competition between one-and two-q-vector nesting.

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“…4 An advantage of the intermediate coupling method is that the diagrammatic perturbation theory of fluctuations can still be applied as long as the Hubbard (Coulomb) U~D, where D is the non-interacting bandwidth. 5,6 Here one starts from the itinerant band picture of electrons where dynamic correlation effects are added perturbatively, giving rise to strong electronic structure renormalization. The fluctuation theory becomes exact in the weak coupling regime, but is rather complicated to treat in the intermediate regime.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent spin fluctuation spectrum and correlated electronic structure of actinides

2013

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We present an overview of various theoretical methods with detailed emphasis on an intermediate Coulomb-U coupling model. This model is based on material-specific ab initio band structure from which correlation effects are computed via self-consistent GW-based self-energy corrections arising from spin fluctuations. We apply this approach to four isostructural intermetallic actinides PuCoIn 5 , PuCoGa 5 , PuRhGa 5 belonging to the Pu-115 family, and UCoGa 5 a member of the U-115 family. The 115 families share the property of spin-orbit split density of states enabling substantial spin fluctuations around 0.5 eV, whose feedback effect on the electronic structure creates mass renormalization and electronic "hot spots," i.e., regions of large spectral weight. A detailed comparison is provided for the angle-resolved and angle-integrated photoemission spectra and de Haas-van Alphen experimental data as available. The results suggest that this class of actinides is adequately described by the intermediate Coulomb interaction regime, where both itinerant and incoherent features coexist in the electronic structure.

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Optical model-solution to the competition between a pseudogap phase and a charge-transfer-gap phase in high-temperature cuprate superconductors

Cited by 39 publications

References 67 publications

Stripes, spin resonance, and nodelessd-wave pairing symmetry in Fe2Se2-based layered superconductors

Stripes, spin resonance, and nodelessd-wave pairing symmetry in Fe2Se2-based layered superconductors

Gutzwiller charge phase diagram of cuprates, including electron–phonon coupling effects

Self-consistent spin fluctuation spectrum and correlated electronic structure of actinides

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