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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
Author(s)
Ahmad, D.Min, B. H.Seo, Y. I.Choi, W. J.Kimura, Shin-IchiSeo, JungpilKwon, Yong Seung
Issued Date
2015-07
Citation
Superconductor Science and Technology, v.28, no.7
Type
Article
Author Keywords
BaFe1.8Co0.2As2optical conductivitysuperconducting gaps
Keywords
Bafe1.8Co0.2As2CONDUCTIVITYDielectric FunctionsEnergy GapFar-Infrared SpectroscopyFILMSGAPInfrared SpectroscopyMagnetic Penetration DepthMETALSOptical ConductivityPlasma FrequenciesSUM-RULESuperconducting 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
Related Researcher
  • 서정필 Seo, Jungpil 화학물리학과
  • Research Interests Topological Matters; High Tc Superconductors; Low dimensional Quantum Matters
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Appears in Collections:
Department of Physics and Chemistry Quantum Functional Materials Laboratory 1. Journal Articles

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