Pseudogap in high-temperature superconductors

Sadovskiǐ, M. V.

doi:10.3367/ufnr.0171.200105c.0539

Cited by 132 publications

(138 citation statements)

References 93 publications

(23 reference statements)

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“…As typical values for ∆ we choose ∆ = t and ∆ = 2t (actually as approximate limiting values -cf. Appendix B) and for the correlation length ξ = 2a and ξ = 10a (motivated mainly by experimental data for cuprates 2,4 ).…”

Section: A Computation Detailsmentioning

confidence: 99%

“…Among the numerous anomalies of the normal phase of high-temperature superconductors the observation of a pseudogap in the electronic spectrum of underdoped copper oxides 1,2 is especially interesting. Despite continuing discussions on the nature of the pseudogap, the preferable "scenario" for its formation is most likely based on the model of strong scattering of the charge carriers by short-ranged antiferromagnetic (AFM, SDW) spin fluctuations 2,3 .…”

Section: Introductionmentioning

confidence: 99%

“…Despite continuing discussions on the nature of the pseudogap, the preferable "scenario" for its formation is most likely based on the model of strong scattering of the charge carriers by short-ranged antiferromagnetic (AFM, SDW) spin fluctuations 2,3 .…”

Section: Introductionmentioning

confidence: 99%

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Pseudogaps in strongly correlated metals: A generalized dynamical mean-field theory approach

et al. 2005

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Section: A Computation Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pseudogaps in strongly correlated metals: A generalized dynamical mean-field theory approach

et al. 2005

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“…This concept was originally introduced by Lee, Rice and Anderson [1] to explain the suppression of electron density of states associated with order parameter fluctuations near a charge density wave instability. According to one school of thought, a similar mechanism may drive the formation of the pseudo-gap in the underdoped cuprates(see reviews [2,3,4]). Many candidate fluctuating order parameters, such as antiferromagnetism [5], charge density wave [6] and pre-formed Cooper pairs have been proposed [7].…”

Section: Introductionmentioning

confidence: 99%

Quenched disorder formulation of the pseudogap problem

Posazhennikova

Coleman

2003

Phys. Rev. B

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The problem of pseudo-gap formation in an electronic system, induced by the fluctuations of the order parameter is revisited. We make the observation that a large class of current theories are theoretically equivalent to averaging the Free energy of the pseudo-gap system over quencheddisordered distribution of the order parameter. We examine the cases of both infinite and finite correlation length, showing how the interplay of pseudo-gap formation and superconductivity can be treated in this approach. *

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“…Pseudogap formation in the electronic spectrum of underdoped copper oxides [1,2] is an especially striking anomaly of the normal state of high-temperature superconductors. Despite continuing discussions on the nature of the pseudogap, we believe that the preferable «scenario» for its formation is most likely based on the model of strong scattering of the charge carriers by short-ranged antiferromagnetic (AFM, SDW) spin fluctuations [2,3].…”

Section: Introductionmentioning

confidence: 99%

Pseudogaps: introducing the length scale into dynamical mean-field theory

Kuchinskiǐ

Некрасов

Sadovskiǐ

2006

Low Temperature Physics

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Pseudogap physics in strongly correlated systems is essentially scale dependent. We generalize the dynamical mean-field theory (DMFT) by introducing into the DMFT equations dependence on the correlation length of pseudogap fluctuations via an additional (momentum-dependent) self-energy S k . This self-energy describes nonlocal dynamical correlations induced by short-ranged collective SDW-like antiferromagnetic spin (or CDW-like charge) fluctuations. At high enough temperatures these fluctuations can be viewed as a quenched Gaussian random field with finite correlation length. This generalized DMFT + S k approach is used for the numerical solution of the weakly doped one-band Hubbard model with repulsive Coulomb interaction on a square lattice with nearest and next nearest neighbor hopping. The effective single impurity problem is solved by the numerical renormalization group (NRG). Both types of strongly correlated metals, namely (i) the doped Mott insulator and (ii) the case of bandwidth W U (U is the value of local Coulomb interaction) are considered. Densities of states, spectral functions and ARPES spectra calculated within DMFT + S k show a pseudogap formation near the Fermi level of the quasiparticle band. We also briefly discuss effects of random impurity scattering. Finally we demonstrate the qualitative picture of Fermi surface «destruction» due to pseudogap fluctuations and formation of «Fermi arcs» which agrees well with ARPES observations.

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Pseudogap in high-temperature superconductors

Abstract: 2.1.´ÇÒÎÑÇÏÍÑÔÕß Ë ÕÖÐÐÇÎËÓÑÄÂÐËÇ

Cited by 132 publications

References 93 publications

Pseudogaps in strongly correlated metals: A generalized dynamical mean-field theory approach

Pseudogaps in strongly correlated metals: A generalized dynamical mean-field theory approach

Quenched disorder formulation of the pseudogap problem

Pseudogaps: introducing the length scale into dynamical mean-field theory

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