Raman study of the electronic continuum in oxide superconductors

Staufer, T.; Hackl, R.; Müller, Patrick

doi:10.1016/0038-1098(90)90770-c

Cited by 69 publications

(22 citation statements)

References 16 publications

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“…This is consistently observed in k-sensitive experiments such as angle-resolved photoemission spectroscopy 21 ͑ARPES͒ and electronic Raman scattering 22,23 ͑ERS͒ even if the details of the interpretation are not completely clear yet. In order to understand the anisotropy momentum-dependent electronic interactions are being considered.…”

Section: Introductionmentioning

confidence: 61%

Carrier relaxation, pseudogap, and superconducting gap in high-Tccuprates: A Raman scattering study

et al. 2000

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We describe the results of electronic Raman-scattering experiments in differently doped single crystals of YBa 2 Cu 3 O 6ϩx and Bi 2 Sr 2 (Ca x Y 1Ϫx )Cu 2 O 8 . The data in antiferromagnetic insulating samples suggest that at least the low-energy parts of the spectra of metallic samples originate predominantly from excitations of free carriers. We therefore propose an analysis of the data in terms of a memory function approach which has been introduced earlier for the current response. Dynamical scattering rates ⌫()ϭ1/() and mass-enhancement factors 1ϩ()ϭm*()/m of the carriers are obtained. It is found that a strong polarization dependence of the carrier lifetime develops towards low doping. In B 2g (xy) symmetry selecting predominantly electrons with momenta along the diagonals of the CuO 2 planes the Raman data compare well with the results obtained from dc and dynamical transport. In B 1g (x 2 Ϫy 2 ) symmetry projecting out momenta along the Cu-O bonds the dc scattering rates of underdoped materials become temperature independent and considerably larger than in B 2g symmetry. This increasing anisotropy is accompanied by a loss of spectral weight in B 2g symmetry in the range between the superconducting transition at T c and a characteristic temperature T* of the order of room temperature which compares well with the pseudogap temperature found in other experiments. The energy range affected by the pseudogap is doping and temperature independent. The integrated spectral loss is approximately 25% in underdoped samples and becomes much weaker towards higher carrier concentration. In underdoped samples, superconductivity-related features in the spectra can be observed only in B 2g symmetry. The peak frequencies scale with T c . We do not find a direct relation between the pseudogap and the superconducting gap.

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Section: Introductionmentioning

confidence: 61%

Carrier relaxation, pseudogap, and superconducting gap in high-Tccuprates: A Raman scattering study

et al. 2000

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“…The resultant electronic Raman response functions that include the effects of inelastic scattering involving spin fluctuations reproduce the behavior of the normal state characteristic of the phenomenological MFL picture that has been studied in earlier publications. 22 In the superconducting state the inelastic scattering rate becomes gapped due to a frequency dependent d x 2 −y 2-wave gap, calculated self-consistently, yielding the characteristic shape of the Raman response. 1 …”

Section: Discussionmentioning

confidence: 99%

Electronic Raman response in anisotropic metals

Einzel

Manske²

2004

Phys. Rev. B

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Using a generalized response theory we derive the electronic Raman response function for metals with anisotropic relaxation rates. The calculations account for the long--range Coulomb interaction and treat the collision operator within a charge conserving relaxation time approximation. We extend earlier treatments to finite wavenumbers ($|{\bf q}|\ll k_{\rm F}$) and incorporate inelastic electron--electron scattering besides elastic impurity scattering. Moreover we generalize the Lindhard density response function to the Raman case. Numerical results for the quasiparticle scattering rate and the Raman response function for cuprate superconductors are presented.Comment: 5 pages, 4figures. accepted in PRB (Brief Report), in pres

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“…(7) we fit (see Fig. 1) the shape of the YBaCuO resonance line [4] with w = 340 cm-1 by the following parameters: 2(ξ(p)γ(p))2/p(γ2(p)) = 8100 cm-2 , g°Pt/(ξ(p)γ(p)) = -0.62, r-1 = 1030 cm -1 , Γ2(k = 0,w) = 9.9 cm-1 . The intrinsic phonon line width 4) = 2.5 cm-1 stems from a fit to the phonon line shape in the insulating state.…”

Section: Susceptibility and Fano Resonancementioning

confidence: 99%

Fano Resonance in a Coupled Electron-Phonon System

Falkovsky

Klama

1997

Acta Phys. Pol. A

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Raman light scattering with excitation of electron-hole continuum and a phonon is investigated theoretically. The effect of a surface and screening of the electron-photon coupling and of the deformation potential as a result of the Coulomb interaction of the electrons is taken into account. The parameters of the 340 cm-1 resonance line in superconducting YBaCuO are estimated by comparing with experimental data.

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Raman study of the electronic continuum in oxide superconductors

Cited by 69 publications

References 16 publications

Carrier relaxation, pseudogap, and superconducting gap in high-Tccuprates: A Raman scattering study

Carrier relaxation, pseudogap, and superconducting gap in high-Tccuprates: A Raman scattering study

Electronic Raman response in anisotropic metals

Fano Resonance in a Coupled Electron-Phonon System

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