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Temperature dependence of the superconducting energy gaps in Ca9.35La0.65(Pt-3 As-8)(Fe2As2)(5) single crystal

Title
Temperature dependence of the superconducting energy gaps in Ca9.35La0.65(Pt-3 As-8)(Fe2As2)(5) single crystal
Authors
Seo, Yu-ilChoi, Woo-jaeAhmad, DawoodKimura, Shin-ichiKwon, Yong Seung
DGIST Authors
Kwon, Yong Seung
Issue Date
2018-06
Citation
Scientific Reports, 8
Type
Article
Article Type
Article
Keywords
articlecrystallow temperaturereflectometrytemperature dependencetheoretical studySKUTTERUDITE INTERMEDIARY LAYERS
ISSN
2045-2322
Abstract
We measured the optical reflectivity R(ω) for an underdoped (Ca0.935La0.065)10(Pt3As8)(Fe2As2)5 single crystal and obtained the optical conductivity σ1(ω) using the K-K transformation. The normal state σ1(ω) at 30 K is well fitted by a Drude-Lorentz model with two Drude components (ωp1 = 1446 cm-1 and ωp2 = 6322 cm-1) and seven Lorentz components. Relative reflectometry was used to accurately determine the temperature dependence of the superconducting gap at various temperatures below Tc. The results clearly show the opening of a superconducting gap with a weaker second gap structure; the magnitudes for the gaps are estimated from the generalized Mattis-Bardeen model to be Δ1 = 30 and Δ2 = 50 cm-1, respectively, at T = 8 K, which both decrease with increasing temperature. The temperature dependence of the gaps was not consistent with one-band BCS theory but was well described by a two-band (hence, two gap) BCS model with interband interactions. The temperature dependence of the superfluid density is flat at low temperatures, indicating an s-wave full-gap superconducting state. © The Author(s) 2018.
URI
http://hdl.handle.net/20.500.11750/6645
DOI
10.1038/s41598-018-24940-9
Publisher
Nature Publishing Group
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
Collection:
Department of Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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