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Evidence for a preformed Cooper pair model in the pseudogap spectra of a Ca-10(Pt4As8)(Fe2As2)(5) single crystal with a nodal superconducting gap

Title
Evidence for a preformed Cooper pair model in the pseudogap spectra of a Ca-10(Pt4As8)(Fe2As2)(5) single crystal with a nodal superconducting gap
Authors
Seo, YuilChoi, Woo-jaeKimura, Shin-ichiKwon, Yong Seung
DGIST Authors
Kwon, Yong Seung
Issue Date
2019-03
Citation
Scientific Reports, 9
Type
Article
Article Type
Article
Keywords
STATESYMMETRYPHASE
ISSN
2045-2322
Abstract
For high-T c superconductors, clarifying the role and origin of the pseudogap is essential for understanding the pairing mechanism. Among the various models describing the pseudogap, the preformed Cooper pair model is a potential candidate. Therefore, we present experimental evidence for the preformed Cooper pair model by studying the pseudogap spectrum observed in the optical conductivity of a Ca 10 (Pt 4 As 8 )(Fe 2 As 2 ) 5 (T c = 34.6 K) single crystal. We observed a clear pseudogap structure in the optical conductivity and observed its temperature dependence. In the superconducting (SC) state, one SC gap with a gap size of Δ = 26 cm −1 , a scattering rate of 1/τ = 360 cm −1 and a low-frequency extra Drude component were observed. Spectral weight analysis revealed that the SC gap and pseudogap are formed from the same Drude band. This means that the pseudogap is a gap structure observed as a result of a continuous temperature evolution of the SC gap observed below T c . This provides clear experimental evidence for the preformed Cooper pair model. © 2019, The Author(s).
URI
http://hdl.handle.net/20.500.11750/9689
DOI
10.1038/s41598-019-40528-3
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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