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Superconductivity and phase instability of NH3-free Na-intercalated FeSe1-zSz

Author

Listed:
  • Jiangang Guo

    (Frontier Research Center, Tokyo Institute of Technology)

  • Hechang Lei

    (Frontier Research Center, Tokyo Institute of Technology)

  • Fumitaka Hayashi

    (Frontier Research Center, Tokyo Institute of Technology)

  • Hideo Hosono

    (Frontier Research Center, Tokyo Institute of Technology
    Materials Research Center for Element Strategy, Tokyo Institute of Technology
    Materials and Structures Laboratory, Tokyo Institute of Technology)

Abstract

The discovery of ThCr2Si2-type AxFe2-ySe2 (A=K, Rb, Cs and Tl) with Tc ~30 K make much progress in iron-based superconducting field, but their multiple-phase separations are disadvantageous for understanding the origin. On the other hand, for small alkali metals, studies on (Li,Na)FeCu(S,Se)2 and NaFe2−δS2 show that these compounds possess CaAl2Si2-type structure, implying that ThCr2Si2-type structure is unstable for small alkali metal-intercalated FeSe under high temperature. Here we report a new intercalate Na0.65(1)Fe1.93(1)Se2 with Tc ~37 K, synthesized by low-temperature ammonothermal method. The notable finding is that the Na0.65(1)Fe1.93(1)Se2 shows a ThCr2Si2-type structure, which is the first instance of small-sized alkali metal intercalates without NH3 co-intercalation. Besides, the NH3-poor Na0.80(4)(NH3)0.60Fe1.86(1)Se2 and NH3-rich phase with Tcs at 45 and 42 K are identified by tuning the concentration of Na-NH3 solutions. The modulation of interlayer spacing reveals the versatile evolution of structural stability and superconductivity in these intercalates.

Suggested Citation

  • Jiangang Guo & Hechang Lei & Fumitaka Hayashi & Hideo Hosono, 2014. "Superconductivity and phase instability of NH3-free Na-intercalated FeSe1-zSz," Nature Communications, Nature, vol. 5(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5756
    DOI: 10.1038/ncomms5756
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