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Superconducting states study in electron-overdoped BaFe1.8Co0.2As2 using terahertz and far-infrared spectroscopy

Title
Superconducting states study in electron-overdoped BaFe1.8Co0.2As2 using terahertz and far-infrared spectroscopy
Authors
Ahmad, D[Ahmad, D.]Min, BH[Min, B. H.]Seo, YI[Seo, Y. I.]Choi, WJ[Choi, W. J.]Kimura, S[Kimura, Shin-Ichi]Seo, J[Seo, Jungpil]Kwon, YS[Kwon, Yong Seung]
DGIST Authors
Ahmad, D[Ahmad, D.]; Min, BH[Min, B. H.]; Seo, YI[Seo, Y. I.]; Choi, WJ[Choi, W. J.]; Seo, J[Seo, Jungpil]; Kwon, YS[Kwon, Yong Seung]
Issue Date
2015-07
Citation
Superconductor Science and Technology, 28(7)
Type
Article
Article Type
Article
Keywords
Bafe1.8Co0.2As2Dielectric FunctionsEnergy GapFar-Infrared SpectroscopyInfrared SpectroscopyMagnetic Penetration DepthOptical ConductivityPlasma FrequenciesSuperconducting Energy GapSuperconducting GapsSuperconducting MaterialsSuperconducting StateTemperature RangeTerahertz Spectroscopy
ISSN
0953-2048
Abstract
Terahertz and far-infrared spectroscopy in the temperature range, 4-300 K were used to study the normal and superconducting states of superconductor BaFe1.8Co0.2As2 with Tc = 22.5 K. At T < Tc, the vanishing of optical conductivity caused by the unity approach and flat behavior in reflectivity were observed below 45 cm-1. This feature indicates the formation of a superconducting energy gap due to the formation of Cooper pairs. The introduction of the two Drudes model well reproduced the normal state optical conductivity, indicating the multiband nature of this superconductor. Two superconducting energy gaps were estimated as = 2.90 meV and = 6.75 meV by the BCS model. Using the sum rule and dielectric function, the superconducting plasma frequency () can be estimated as 5170 ± 270 cm-1, yielding that the magnetic penetration depth (λ) is 3090 ± 160 . This material was observed to fall on the universal scaling line, Nc ∼ 4.4. © 2015 IOP Publishing Ltd.
URI
http://hdl.handle.net/20.500.11750/2341
DOI
10.1088/0953-2048/28/7/075002
Publisher
Institute of Physics Publishing
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceNanospm Lab(Quantum Physics Research Group)1. Journal Articles


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