Singularities in the optical response of cuprates

Abanov, Ar.; Chubukov, Andrey V.; Schmalian, Jörg

doi:10.1103/physrevb.63.180510

Cited by 55 publications

(84 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…20, its frequency strongly depends on the value of g. The main differences are: (a) In the spectra of Ref. 33, σ 1 = 0 for frequencies below the onset. In our spectra, ∆σ 1 acquires nonzero values already above the first onset frequency of ∼ ∆ 0 +hω 0 .…”

Section: Resultsmentioning

confidence: 99%

“…Its absence in the spectra of Ref. 33 is due to the fact that details of the dispersion relation have been neglected.…”

Section: Resultsmentioning

confidence: 99%

“…The coupling strength inferred from experiment is found to be sufficient to account for the high value of T c . The relation between σ 1 (ω) and the magnetic mode has been further explored by Abanov, Chubukov, and Schmalian (ACS) 33,34 . For example, they predicted a sharp onset of σ 1 (ω) located athω = 2∆ 0 +hω 0 (see Fig.…”

Section: Introductionmentioning

confidence: 99%

“…2 of Ref. 33). The three approaches (MBC, CSB, ACS) differ in their emphasis and computational formalism.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Interpretation of in-plane infrared response of high-Tccuprate superconductors involving spin fluctuations using quasiparticle spectral functions

et al. 2005

View full text Add to dashboard Cite

The in-plane infrared response of the high-Tc cuprate superconductors was studied using the spin-fermion model, where charged quasiparticles of the copper-oxygen planes are coupled to spin fluctuations. First, we analyzed structures of the superconducting-state conductivity reflecting the coupling of the quasiparticles to the resonance mode observed by neutron scattering. The conductivity σ computed with the input spin susceptibility in the simple form of the mode exhibits two prominent features: an onset of the real part of σ starting around the frequency ω0 of the mode and a maximum of a related function W (ω), roughly proportional to the second derivative of the scattering rate [1/τ ](ω), centered approximately at ω = ω0 + ∆0/h, where ∆0 is the maximum value of the superconducting gap. The two structures are well known from earlier studies. Their physical meaning, however, has not been sufficiently elucidated thus far. Our analysis involving quasiparticle spectral functions provides a clear interpretation. Second, we explored the role played by the spin-fluctuation continuum, whose spectral weight is known to be much larger than the one of the mode. We have shown that the experimental spectra of 1/τ can be approximately reproduced by augmenting the resonant-mode component of the spin susceptibility by a suitable continuum component with a considerably higher spectral weight and with a characteristic width of several hundreds meV. The computed spectra of 1/τ display a new structure in the mid-infrared which is related to the finite width of the occupied part of the conduction band. Third, we investigated the temperature dependence (TD) of σ assuming that the normal state spin susceptibility consists of an overdamped low energy mode and the continuum component. The differences between the experimental normal-state spectra and those of the superconducting state, including some interesting effects at higher frequencies, are reasonably well reproduced. Motivated by recent experimental 304, 708 (2004).], we further studied the TDs of the effective kinetic energy K.E. and of the intraband spectral weight IO. Calculations for the trivial case of noninteracting quasiparticles in the normal state and a BCS-like superconducting state reveal a strong sensisitivity of the TD of IO to details of the dispersion relation. The TDs of K.E. and IO in the interacting case, for the set of the values of the input parameters used throughout this work, are similar to those of the trivial case. The physics beyond the changes occuring when going from the normal to the superconducting state, however, is shown to be more complex, involving, besides the formation of the gap, also a feedback effect of the spin fluctuations on the quasiparticles and a significant shift of the chemical potential.I.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Its absence in the spectra of Ref. 33 is due to the fact that details of the dispersion relation have been neglected.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…2 of Ref. 33). The three approaches (MBC, CSB, ACS) differ in their emphasis and computational formalism.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interpretation of in-plane infrared response of high-Tccuprate superconductors involving spin fluctuations using quasiparticle spectral functions

et al. 2005

View full text Add to dashboard Cite

show abstract

“…6). Later on, more rigorous theoretical approach 66 shows that the maximum in W (ω) should occur at about 2∆ M + E r rather than at ∆ M + E r . Then we should expect a maximum in W (ω) to occur at 96-98 meV, in disagreement with experiment.…”

mentioning

confidence: 99%

Pairing interactions and pairing mechanism in high-temperature copper oxide superconductors

Zhao

2005

Phys. Rev. B

View full text Add to dashboard Cite

The polaron binding energy Ep in undoped parent cuprates has been determined to be about 1.0 eV from the unconventional oxygen-isotope effect on the antiferromagnetic ordering temperature. The deduced value of Ep is in quantitative agreement with that estimated from independent optical data and that estimated theoretically from the measured dielectric constants. The substantial oxygenisotope effect on the in-plane supercarrier mass observed in optimally doped cuprates suggests that polarons are bound into the Cooper pairs. We also identify the phonon modes that are strongly coupled to conduction electrons from the angle-resolved photoemission spectroscopy, tunneling spectra, and optical data. We consistently show that there is a very strong electron-phonon coupling feature at a phonon energy of about 20 meV along the antinodal direction and that this coupling becomes weaker towards the diagonal direction. We further show that high-temperature superconductivity in cuprates is caused by strong electron-phonon coupling, polaronic effect, and significant coupling with 2 eV Cu-O charge transfer fluctuation.

show abstract

Electrodynamics of correlated electron matter

Dordevic¹,

Basov²

2006

Ann. Phys.

View full text Add to dashboard Cite

Infrared spectroscopy has emerged as a premier experimental technique to probe enigmatic effects arising from strong correlations in solids. Here we report on recent advances in this area focusing on common patterns in correlated electron systems including transition metal oxides, intermetallics and organic conductors. All these materials are highly conducting substances but their electrodynamic response is profoundly different from the canonical Drude behavior observed in simple metals. These unconventional properties can be attributed in several cases to the formation of spin and/or charge ordered states, zero temperature phase transitions and strong coupling to bosonic modes

show abstract

Singularities in the optical response of cuprates

Cited by 55 publications

References 32 publications

Interpretation of in-plane infrared response of high-Tccuprate superconductors involving spin fluctuations using quasiparticle spectral functions

Interpretation of in-plane infrared response of high-Tccuprate superconductors involving spin fluctuations using quasiparticle spectral functions

Pairing interactions and pairing mechanism in high-temperature copper oxide superconductors

Electrodynamics of correlated electron matter

Contact Info

Product

Resources

About