Eliashberg treatment of the microwave conductivity of niobium

Marsiglio, F.; Ćarbotte, J. P.; Akis, R.; Achkir, D.; Poirier, M.

doi:10.1103/physrevb.50.7203

Cited by 22 publications

(18 citation statements)

References 22 publications

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“…As the temperature is lowered, we observe a considerably higher conductivity in the frequency range below the superconducting energy gap than predicted. Our findings agree with the measurements of the surface impedance at ϭ0.6 cm Ϫ1 by Marsiglio et al 14 who found 1 / n Ϸ1.8 which is about a factor of 3 higher than the BCS value at T/T c ϭ0.54. Both results are not compatible with the surface-impedance measurements performed at 2 cm Ϫ1 .…”

Section: Discussionsupporting

confidence: 93%

“…In agreement with the findings of Marsiglio et al, 14 our data cannot be described by the Eliashberg theory using F()␣ 2 () obtained from tunneling measurements. The frequency and temperature dependence of the conductivity below the superconducting energy gap may provide important information about the electron-phonon spectral function and the inelastic scattering rate.…”

Section: Discussionsupporting

confidence: 93%

“…A good agreement with the weakcoupling predictions was obtained from measurement of the temperature-dependent surface impedance by Klein et al;13 for their data strong-coupling correction led to only a minor improvement of the fit. Marsiglio et al 14 were not able to describe their results obtained by a similar technique at a somewhat lower frequency either by the simple BCS model or by performing calculations according to the Eliashberg theory with the behavior of F()␣ 2 () evaluated from tunneling measurements.…”

Section: Introductionmentioning

confidence: 99%

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Direct observation of the superconducting energy gap developing in the conductivity spectra of niobium

et al. 1998

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The electrodynamic response of Nb in the frequency range above and below the energy gap 2⌬ is studied in the normal and in the superconducting state. A coherent source interferometer is utilized in the spectral range between 5 and 30 cm Ϫ1 to investigate the amplitude and the phase of the transmission through niobium films that allows the direct determination of both components of the complex conductivity. The optical conductivity up to 300 cm Ϫ1 is evaluated using infrared reflection measurements. Below the 8.31-K superconducting transition temperature of the 150-Å-thick film, the superconducting energy gap is observed to increase as the temperature decreases. The overall frequency dependence of the conductivity can be described using the BCS formalism and assuming finite scattering effects; however, at low temperatures we find deviations from the predicted behavior in the spectral range below the energy gap. Estimations of the gap at zero temperature 2⌬(0)ϭ24 cm Ϫ1 or 4.1k B T c deviate from the weak-coupling BCS limit.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Direct observation of the superconducting energy gap developing in the conductivity spectra of niobium

et al. 1998

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“…In this paper, in the T 1 1 calculation only these cross terms are used to emphasize the interband character of the superconductivity, as it is these cross terms that are most enhanced by the nearly antiferromagnetic state within a more detailed random phase approximation (RPA). For a single band system, the full expression is proportional to equation (4) when σ dc 1 → ∞ [14], but in multiband systems 1/T 1 T and σ 1 (ω → 0) can behave differently.…”

Section: General Expressionsmentioning

confidence: 99%

Hydrogen Segregation and Its Detrimental Effect in Epitaxial Growth of Ge Thin Film on Hydrogen-Terminated Si(001) Surface

Fujino¹,

Okuno²,

Katayama³

et al. 2001

Jpn. J. Appl. Phys.

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We consider a two-band superconductor with relative phase π between the two order parameters as a model for the superconducting state in ferropnictides. Within this model we calculate the microwave response and the NMR relaxation rate. The influence of intra-and interband impurity scattering beyond the Born and unitary limits is taken into account. We show that, depending on the scattering rate, various types of power law temperature dependences of the magnetic field penetration depth and the NMR relaxation rate at low temperatures may take place. References 10

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“…Despite numerous studies [3,4,5,6], for Nb the influence of the strong coupling on optical properties is not as clear as it is for Pb or Hg, for instance. Most recent reports on experimental results of the surface impedance in the microwave region are rather contradictory.…”

mentioning

confidence: 98%

Far-infrared electrodynamics of superconducting Nb: comparison of theory and experiment

Karakozov

Maksimov

Пронин

2004

Solid State Communications

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Eliashberg treatment of the microwave conductivity of niobium

Cited by 22 publications

References 22 publications

Direct observation of the superconducting energy gap developing in the conductivity spectra of niobium

Direct observation of the superconducting energy gap developing in the conductivity spectra of niobium

Hydrogen Segregation and Its Detrimental Effect in Epitaxial Growth of Ge Thin Film on Hydrogen-Terminated Si(001) Surface

Far-infrared electrodynamics of superconducting Nb: comparison of theory and experiment

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