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Superconducting properties of SmFeAsO1− xprepared under high-pressure condition

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
71
Issue
4
Identifiers
DOI: 10.1016/j.jpcs.2009.12.019
Keywords
  • A. Superconductors
  • B. Inorganic Compounds
  • C. Superconductivity
  • D. Electronic Structure
  • E. Magnetic Properties
Disciplines
  • Physics

Abstract

Abstract Synthetic conditions such as stoichiometries, temperature and pressure are optimized to achieve a high quality oxygen deficient SmFeAsO 0.6 superconductor. Both electric and magnetic measurements show a sharp superconducting transition at about 55 K. Several important physical parameters are deduced. The apparent superconducting gap observed in heat capacity with 2 Δ o/ k B T c of 4.57 larger than that of previous fluorine replaced samples indicate that this superconductivity will not strongly conflict with the phonon-mediated BCS mechanism. The mean free length ℓ=18.8 nm and the coherent length ξ=2.3–3.3 nm show that the superconductivity is in the clean limit.

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