Electronic Raman scattering in CuO2 superconductors

Hackl, R.; Opel, Matthias; Müller, Patrick; Krug, G.; Stadlober, Barbara; Nemetschek, R.; Berger, H.; Forró, Lászlø

doi:10.1007/bf00768471

Cited by 26 publications

(50 citation statements)

References 26 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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“…5). While impurities do yield a channel dependent response if the V LL are different for different L, since the spectra have a peak at the scattering rate and then fall off at large ω, it cannot fit the large flat continuum observed in Raman experiments extending up to the scale of a few eVs [4][5][6][7][8].…”

Section: Perturbation Theory and Role Of Scatteringmentioning

confidence: 99%

“…Raman measurements on several systems have shown a remarkable channel dependence in the normal state for the optimallyand under-doped cuprates in a variety of systems [4][5][6][7][8]. For scattering geometries of B 1g symmetry, an almost [8] temperature independent Raman spectrum has been observed up to frequencies of a few J, while for B 2g orientations the spectra show a temperature dependence that tracks that of the DC resistivity [5,7].…”

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confidence: 99%

Theory of electronic Raman scattering in nearly antiferromagnetic Fermi liquids

Devereaux

Kampf

1999

Phys. Rev. B

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A theory of electronic Raman scattering in nearly antiferromagnetic Fermi liquids is constructed using the phenomenological electron-electron interaction introduced by Millis, Monien, and Pines. The role of "hot spots" and their resulting signatures in the channel dependent Raman spectra is highlighted, and different scaling regimes are addressed. The effects of self consistency and vertex corrections are compared to a perturbative treatment of the interaction. The theory is then compared to Raman spectra taken in the normal state of cuprate superconductors, and it is shown that many features of the symmetry dependent spectra can be explained by the theory. Remaining questions are addressed.

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“…Hackl et al 23 and Blumberg and Klein 24 have pointed out the close connection between B 2g Raman and in the ab-plane conductivity. Opel et al 25 and Venturini et al 26 compared the Raman relaxation rate in each channel, defined as the inverse of the slope of the low-energy Raman response ⌫ 1,2 ͑Y-123͒ and Bi 2 Sr 2 CaCu 2 O 8ϩ␦ ͑Bi-2212͒, it was found that for B 2g symmetry, ⌫ 2 R ͓Fig.…”

Section: Introductionmentioning

confidence: 96%

Optical symmetries and anisotropic transport in high-Tcsuperconductors

Devereaux

2003

Phys. Rev. B

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A simple symmetry analysis of in-plane and out-of-plane transport in a family of high-temperature superconductors is presented. It is shown that generalized scaling relations exist between the low-frequency electronic Raman response and the low-frequency in-plane and out-of-plane conductivities in both normal and superconducting states of the cuprates. Specifically, for both normal and superconducting states, the temperature dependence of the low-frequency B 1g Raman slope scales with the c-axis conductivity, while the B 2g Raman slope scales with the in-plane conductivity. Comparison with experiments in the normal states of Bi-2212 and Y-123 implies that the nodal transport is largely doping independent and metallic, while transport near the Brillouin Zone axes is governed by a quantum critical point near doping pϳ0.22 holes per CuO 2 plaquette. Important differences for La-214 are discussed. It is also shown that the c-axis conductivity rise for TӶT c is a consequence of partial conservation of in-plane momentum for out-of-plane transport.

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Electronic Raman scattering in CuO2 superconductors

Cited by 26 publications

References 26 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

Theory of electronic Raman scattering in nearly antiferromagnetic Fermi liquids

Optical symmetries and anisotropic transport in high-Tcsuperconductors

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