Unusual doping dependence of superconductivity in Nay FeAs

K. Sasmal, B. Lv, Z. J. Tang, F. Chen, Y. Y. Xue, B. Lorenz, A. M. Guloy, C. W. Chu

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Superconductivity and phase relationships were explored in the Na-Fe-As system. The PbFCl-type 111 phase is stable only within a Na stoichiometry range of 1.00 to ∼0.85, and exhibits bulk superconductivity within an even narrower range around 0.90 in Na0.9 FeAs. In particular, stoichiometric NaFeAs is not a bulk superconductor. The onset of the superconducting transition varies in a totally different way and the highest Tc occurs in multiphase samples with a nominal composition of Na:Fe:As=0.5:1:1, where the superconductive volume-fraction is almost zero. Such doping dependency is rather surprising and in disagreement with most expectations.

Original languageEnglish
Article number184516
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number18
Publication statusPublished - 2009 May 18

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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