Optical spectroscopy was used to study the electrodynamics and hidden transport properties of a BaFe1.91Ni0.09As2thin superconducting film. We analyzed the normal state data using a Drude-Lorentz model with two Drude components: one narrow (D1) and another broad one (D2). In the superconducting state, two gaps with 2Δ(2)0/kBTc= 1.9-2.0 and 2Δ(1)0/kBTc= 4.0-4.3 are formed from the narrow component D1while the broad component D2remains ungapped. The calculated total DC resistivity of the film and the low-temperature scattering rate for the narrow Drude component show a hidden Fermi-liquid behavior. The change of total electron-boson coupling (λtot) and representative energy (Ω0) in the normal state with respect to the superconducting state is typical of other iron-based materials as well as high-temperature superconducting (HTSC) cuprates.

Optical and hidden transport properties of BaFe1.91Ni0.09As2 film / A Aleshchenko, Yurii; V Muratov, Andrey; Ummarino, Giovanni; Richter, Stefan; Anna Thomas, Aleena; Hühne, Ruben. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - ELETTRONICO. - (2020). [10.1088/1361-648X/abbc33]

Optical and hidden transport properties of BaFe1.91Ni0.09As2 film

Giovanni Alberto Ummarino;
2020

Abstract

Optical spectroscopy was used to study the electrodynamics and hidden transport properties of a BaFe1.91Ni0.09As2thin superconducting film. We analyzed the normal state data using a Drude-Lorentz model with two Drude components: one narrow (D1) and another broad one (D2). In the superconducting state, two gaps with 2Δ(2)0/kBTc= 1.9-2.0 and 2Δ(1)0/kBTc= 4.0-4.3 are formed from the narrow component D1while the broad component D2remains ungapped. The calculated total DC resistivity of the film and the low-temperature scattering rate for the narrow Drude component show a hidden Fermi-liquid behavior. The change of total electron-boson coupling (λtot) and representative energy (Ω0) in the normal state with respect to the superconducting state is typical of other iron-based materials as well as high-temperature superconducting (HTSC) cuprates.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2847831