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Keywords = multiband Eliashberg theory

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8 pages, 3270 KB  
Article
Mathematical and Physical Properties of Three-Band s± Eliashberg Theory for Iron Pnictides
by Giovanni Alberto Ummarino
Magnetochemistry 2023, 9(1), 28; https://doi.org/10.3390/magnetochemistry9010028 - 11 Jan 2023
Cited by 2 | Viewed by 2306
Abstract
The phenomenology of the iron pnictide superconductor can be described by the three-band s± Eliashberg theory in which the mechanism of superconducting coupling is mediated by antiferromagnetic spin fluctuations and whose characteristic energy Ω0 scales with Tc according to the [...] Read more.
The phenomenology of the iron pnictide superconductor can be described by the three-band s± Eliashberg theory in which the mechanism of superconducting coupling is mediated by antiferromagnetic spin fluctuations and whose characteristic energy Ω0 scales with Tc according to the empirical law Ω0=4.65kBTc. This model presents the universal characteristics that are independent of the critical temperature, such as the link between the two free parameters λ13 and λ23 and the ratio Δi/kBTc. Full article
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13 pages, 546 KB  
Article
Eliashberg Theory of a Multiband Non-Phononic Spin Glass Superconductor
by Giovanni Alberto Ummarino
Magnetochemistry 2020, 6(4), 51; https://doi.org/10.3390/magnetochemistry6040051 - 16 Oct 2020
Cited by 1 | Viewed by 3653
Abstract
I solved the Eliashberg equations for a multiband non-phononic s± wave spin-glass superconductor, calculating the temperature dependence of the gaps and of superfluid density. Their behaviors were revealed to be unusual: showing non-monotonic temperature dependence and reentrant superconductivity. By considering particular input [...] Read more.
I solved the Eliashberg equations for a multiband non-phononic s± wave spin-glass superconductor, calculating the temperature dependence of the gaps and of superfluid density. Their behaviors were revealed to be unusual: showing non-monotonic temperature dependence and reentrant superconductivity. By considering particular input parameters values that could describe the iron pnictide EuFe2(As1xPx)2, a rich and complex phase diagram arises, with two different ranges of temperature in which superconductivity appears. Full article
(This article belongs to the Special Issue Superconductivity and Magnetism)
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