Inversion techniques for optical conductivity data

Schachinger, E.; Neuber, Danilo R.; Ćarbotte, J. P.

doi:10.1103/physrevb.73.184507

Cited by 72 publications

(143 citation statements)

References 55 publications

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“…For optimally doped Bi-2212 with T c = 96 K the peak in the spectral density is closer to 60 meV, but Schachinger et al (2000) found that in a second Bi-2212 sample with a lower T c of 90 K from the optical data of Puchkov et al (1996), the peak was instead at 43 meV. The same value was found by Schachinger et al (2006) based on data in Bi-2212 by Tu et al (2002). To improve the quality of the sample the material used in figure 31 had some Y doping and some of the differences in the recovered spectra could be related to sample dependence.…”

Section: Tunnellingsupporting

confidence: 66%

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Bosons in high-temperature superconductors: an experimental survey

Ćarbotte¹,

Timusk²,

Hwang³

2011

Rep. Prog. Phys.

116

164

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Abstract. We review a number of experimental techniques that are beginning to reveal fine details of the bosonic spectrum α 2 F (Ω) that dominates the interaction between the quasiparticles in high temperature superconductors. Angle-resolved photo emission (ARPES) shows kinks in electronic dispersion curves at characteristic energies that agree with similar structures in the optical conductivity and tunnelling spectra. Each technique has its advantages. ARPES is momentum resolved and offers independent measurements of the real and imaginary part of the contribution of the bosons to the self energy of the quasiparticles. The optical conductivity can be used on a larger variety of materials and with the use of maximum entropy techniques reveals rich details of the spectra including their evolution with temperature and doping. Scanning tunnelling spectroscopy offers spacial resolution on the unit cell level. We find that together the various spectroscopies, including recent Raman results, are pointing to a unified picture of a broad spectrum of bosonic excitations at high temperature which evolves, as the temperature is lowered into a peak in the 30 to 60 meV region and a featureless high frequency background in most of the materials studied. This behaviour is consistent with the spectrum of spin fluctuations as measured by magnetic neutron scattering. However, there is evidence for a phonon contribution to the bosonic spectrum as well.arXiv:1105.0726v1 [cond-mat.supr-con]

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Section: Tunnellingsupporting

confidence: 66%

“…the superconducting state of our equations 12 and 21 as developed by Schachinger et al (2006). At zero temperature the appropriate kernel which replaced the kernel K(ω, Ω, T ) in equation 21 is…”

Section: Optical Propertiesmentioning

confidence: 99%

Bosons in high-temperature superconductors: an experimental survey

Ćarbotte¹,

Timusk²,

Hwang³

2011

Rep. Prog. Phys.

116

164

View full text Add to dashboard Cite

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“…[33] where a maximum entropy technique is also described which allows one to recover the electron-boson spectral function I 2 χ(Ω) from a knowledge of the scattering rates 1/τ op (ω). A summary of this technique is given as follows.…”

Section: Formalismsmentioning

confidence: 99%

“…and in the superconducting state with isotropic [37,33] s-wave gap (anisotropy neglected [5,6,39]) in the clean limit by…”

Section: Formalismsmentioning

confidence: 99%

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Electron-boson spectral density of LiFeAs obtained from optical data

Hwang

Ćarbotte

Min

et al. 2015

J. Phys.: Condens. Matter

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Abstract. We analyze existing optical data in the superconducting state of LiFeAs at T = 4 K, to recover its electron-boson spectral density. A maximum entropy technique is employed to extract the spectral density I 2 χ(ω) from the optical scattering rate. Care is taken to properly account for elastic impurity scattering which can importantly affect the optics in an s-wave superconductor, but does not eliminate the boson structure. We find a robust peak in I 2 χ(ω) centered about Ω R ∼ = 8.0 meV or 5.3 k B T c (with T c = 17.6 K). Its position in energy agrees well with a similar structure seen in scanning tunneling spectroscopy (STS). There is also a peak in the inelastic neutron scattering (INS) data at this same energy. This peak is found to persist in the normal state at T = 23 K. There is evidence that the superconducting gap is anisotropic as was also found in low temperature angular resolved photoemission (ARPES) data.

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Electrodynamics of correlated electron matter

Dordevic¹,

Basov²

2006

Ann. Phys.

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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

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Inversion techniques for optical conductivity data

Cited by 72 publications

References 55 publications

Bosons in high-temperature superconductors: an experimental survey

Bosons in high-temperature superconductors: an experimental survey

Electron-boson spectral density of LiFeAs obtained from optical data

Electrodynamics of correlated electron matter

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