Predictions of Multiband s± Strong-Coupling Eliashberg Theory Compared to Experimental Data in Iron Pnictides

Ummarino, Giovanni; Daghero, Dario; Tortello, Mauro; Gonnelli, Renato

doi:10.1007/s10948-010-1006-3

Cited by 23 publications

(45 citation statements)

References 36 publications

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“…The imaginary-axis equations 53–55 read: where and are the scattering rates from non-magnetic and magnetic impurities, respectively, and whereΘ is the Heaviside function and ω c is a cutoff energy. The quantities are the elements of the 3 × 3 Coulomb pseudopotential matrix.…”

Section: Methodsmentioning

confidence: 99%

Effects of disorder induced by heavy-ion irradiation on (Ba1−x K x )Fe2As2 single crystals, within the three-band Eliashberg s± wave model

Ghigo

Ummarino

Gozzelino

et al. 2017

Sci Rep

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One of the open issues concerning iron-based superconductors is whether the s± wave model is able to account for the overall effects of impurity scattering, including the low rate of decrease of the critical temperature with the impurity concentration. Here we investigate Ba1−xKxFe2As2 crystals where disorder is introduced by Au-ion irradiation. Critical temperature, T c, and London penetration depth, λ L, were measured by a microwave resonator technique, for different values of the irradiation fluence. We compared experimental data with calculations made on the basis of the three-band Eliashberg equations, suitably accounting for the impurity scattering. We show that this approach is able to explain in a consistent way the effects of disorder both on T c and on λ L(T), within the s± wave model. In particular, a change of curvature in the low-temperature λ L(T) curves for the most irradiated crystals is fairly well reproduced.

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Section: Methodsmentioning

confidence: 99%

Effects of disorder induced by heavy-ion irradiation on (Ba1−x K x )Fe2As2 single crystals, within the three-band Eliashberg s± wave model

Ghigo

Ummarino

Gozzelino

et al. 2017

Sci Rep

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“…The same can be done for the scattering rate from magnetic impurities: Γ M ij = 0. At least as a starting point, let us make further assumptions that have been shown to be valid for iron pnictides [33,37,38]. Following ref.…”

Section: The Modelmentioning

confidence: 99%

THz electrodynamics of BaFe_1.91Ni_0.09As₂ film analyzed in the framework of multiband Eliashberg theory

Ummarino¹,

Muratov²,

Kadyrov³

et al. 2020

Supercond. Sci. Technol.

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The temperature dependences of the plasma frequency, superfluid density and London penetration depth were determined from terahertz spectra of conductivity and dielectric permittivity of BaFe 1.91 Ni 0.09 As 2 film with critical temperature T c = 19.6 K. Part of experimental data were analyzed within a simple three-band Eliashberg model where the mechanism of superconducting coupling is mediated by antiferromagnetic spin fluctuations, whose characteristic energy Ω 0 scales with T c according to the empirical law Ω 0 = 4.65k B T c , and with a total electron-boson coupling strength λ tot = 2.17.

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“…For the case of pnictide superconductors, they can be interpreted within a three-band Eliashberg model. 33 For even higher voltages there is a parabolic decreasing background, which can be explained by Joule heating of the junction. fig.…”

Section: A Josephson Junctionsmentioning

confidence: 99%

Investigation of TiOx barriers for their use in hybrid Josephson and tunneling junctions based on pnictide thin films

Döring

Monecke

Schmidt

et al. 2014

Journal of Applied Physics

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We tested oxidized titanium layers as barriers for hybrid Josephson junctions with high I c R n -products and for the preparation of junctions for tunneling spectroscopy. For that we firstly prepared junctions with conventional superconductor electrodes lead and niobium, respectively. By tuning the barrier thickness we were able to change the junctions' behavior from a Josephson junction to tunnel-like behavior applicable for quasi-particle spectroscopy. Subsequently, we transferred the technology to junctions using Co-doped BaFe 2 As 2 thin films prepared by pulsed laser deposition as base electrode and evaporated Pb as counter electrode. For barriers with a thickness of 1.5 nm we observe clear Josephson effects with I c R n ≈ 90 µV at 4.2 K. These junctions behave SNS'-like and are dominated by Andreev reflection transport mechanism. For junctions with barrier thickness of 2.0 nm and higher no Josephson but SIS'-or SINS'-like behavior with a tunnel-like conductance spectrum was observed.

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Predictions of Multiband s± Strong-Coupling Eliashberg Theory Compared to Experimental Data in Iron Pnictides

Cited by 23 publications

References 36 publications

Effects of disorder induced by heavy-ion irradiation on (Ba1−x K x )Fe2As2 single crystals, within the three-band Eliashberg s± wave model

Effects of disorder induced by heavy-ion irradiation on (Ba1−x K x )Fe2As2 single crystals, within the three-band Eliashberg s± wave model

THz electrodynamics of BaFe_1.91Ni_0.09As₂ film analyzed in the framework of multiband Eliashberg theory

Investigation of TiOx barriers for their use in hybrid Josephson and tunneling junctions based on pnictide thin films

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Predictions of Multiband s± Strong-Coupling Eliashberg Theory Compared to Experimental Data in Iron Pnictides

Cited by 23 publications

References 36 publications

Effects of disorder induced by heavy-ion irradiation on (Ba1−x K x )Fe2As2 single crystals, within the three-band Eliashberg s± wave model

Effects of disorder induced by heavy-ion irradiation on (Ba1−x K x )Fe2As2 single crystals, within the three-band Eliashberg s± wave model

THz electrodynamics of BaFe1.91Ni0.09As2 film analyzed in the framework of multiband Eliashberg theory

Investigation of TiOx barriers for their use in hybrid Josephson and tunneling junctions based on pnictide thin films

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Product

Resources

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THz electrodynamics of BaFe_1.91Ni_0.09As₂ film analyzed in the framework of multiband Eliashberg theory