Singular behavior of the Emery model with O-O hopping for high-T
                $\mathsf{_c}$
               superconductors

Mrkonjić, Ivana; Barišić, S.

doi:10.1140/epjb/e2003-00198-y

Cited by 21 publications

(70 citation statements)

References 31 publications

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“…The single-particle dispersions obtained on the hole-doped side within the paramagnetic noncrossing-approximation ͑NCA͒ ͑Ref. 16͒ or dynamical mean-field theory 17 approaches are similar to those found by the simple mean-field slave-boson ͑MFSB͒ theory, 15,18 when the latter is supplemented by harmonic boson fluctuations around the meanfield saddle point. The band dispersions introduce the nonmagnetic energy scales of the order of 0.1 eV and less, in particular through the splitting between the resonant band and the main band.…”

Section: Introductionsupporting

confidence: 68%

“…16 It reflects the same nonmagnetic 0.1 eV energy scales, in particular through the processes of charge excitations from the main oxygen band to the resonant band. The agreement between the calculated single-particle 18 and electron-hole Raman 16 properties and the corresponding ARPES ͑Refs. 19-22͒ and Raman 2,4 measurements on La 2−x Sr x CuO 4 family of materials is remarkable.…”

Section: Introductionmentioning

confidence: 55%

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Electronic Raman scattering in a multiband model for cuprate superconductors

Kupčić

Barišić

2007

Phys. Rev. B

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Charge-charge, current-current, and Raman correlation functions are derived in a consistent way using the unified response theory. The theory is based on the improved description of the conduction electron coupling to the external electromagnetic fields, distinguishing further the direct and indirect ͑assisted͒ scattering on the quasistatic disorder. The two scattering channels are distinguished in terms of the energy and momentum conservation laws. The theory is illustrated on the Emery three-band model for the normal state of the underdoped high-T c cuprates which includes the incoherent electron scattering on the disorder associated with the quasistatic fluctuations around the static antiferromagnetic ͑AF͒ ordering. It is shown, for the first time consistently, that the incoherent indirect processes dominate the low-frequency part of the Raman spectra, while the long-range screening which is dynamic removes the long-range forces in the A 1g channel. In the mid-infrared frequency range the coherent AF processes are dominant. In contrast to the nonresonant B 1g response, which is large by itself, the resonant interband transitions enhance both the A 1g and B 1g Raman spectra to comparable values, in good agreement with experimental observation. It is further argued that the AF correlations give rise to the mid-infrared peak in the B 1g Raman spectrum, accompanied by a similar peak in the optical conductivity. The doping behavior of these peaks is shown to be correlated with the linear doping dependence of the Hall number, as observed in all underdoped high-T c compounds.

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Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 55%

Electronic Raman scattering in a multiband model for cuprate superconductors

Kupčić

Barišić

2007

Phys. Rev. B

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“…Our data imply that the changes in density of states cannot be the sole explanation of the measured high-T c . However, we note that recent detailed calculations of the effective band structure of cuprates, taking into account strong correlation effects, can accurately reproduce measured energy bands of LSCO-214, Bi2212 and Y-123 [32]. So, presumably an extension of such an approach could account for our measured strain effects too.…”

Section: Main Results and Discussionmentioning

confidence: 56%

Direct photoemission spectroscopy and electronic properties of in situ grown, strained high-Tc and related oxide films

Abrecht

Ariosa

Cloetta

et al. 2004

Journal of Physics and Chemistry of Solids

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“…30 We emphasize that while the quoted numerical values have been chosen to fit experiment, they do fall into the range characteristic of strong renormalization, as found by the slave boson studies. 28 In particular, the ratio ∆ pf ≈ −4t turns out to be characteristic of the strong-coupling limit.…”

Section: Strong Coulomb Repulsionmentioning

confidence: 98%

Central peak in the pseudogap of high T c superconductors

Sunko

Barišić

2005

SPIE Proceedings

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A detailed theoretical description is provided of the narrow low-energy peak in the ARPES response of superconducting optimally doped and weakly underdoped BSCCO near the van Hove point. The pseudogap is taken to be due to electronparamagnon scattering. The narrow peak is antiadiabatic: it consists of electrons which are so slow that the scattering is not effective in suppressing their spectral strength. We find two temperature regimes for the pseudogap. The low-temperature one is relevant for experiment in BSCCO, where the paramagnon band-edge is much higher than the temperature. The hightemperature regime occurs when the band-edge is lower than the temperature. It is characterized by hot spots when the band-edge is finite, and develops a macroscopic antiferromagnetic potential when it vanishes. We argue that it is relevant for the electron-doped high-T c compounds. Our work gives a connection between the simultaneous appearance of a magnetic resonance and a narrow low-energy feature in ARPES at the superconducting transition in BSCCO. In the model, both can be obtained by switching the paramagnon damping from supercritical to subcritical, without even including the superconducting correlations explicitly. The leading edge scale of the narrow peak is controlled by the chemical potential and is incidental to the pseudogap mechanism, whose physical scale is given by the high-energy 'hump.'

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Singular behavior of the Emery model with O-O hopping for high-T $\mathsf{_c}$ superconductors

Cited by 21 publications

References 31 publications

Electronic Raman scattering in a multiband model for cuprate superconductors

Electronic Raman scattering in a multiband model for cuprate superconductors

Direct photoemission spectroscopy and electronic properties of in situ grown, strained high-Tc and related oxide films

Central peak in the pseudogap of high T c superconductors

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