Regular Article

The European Physical Journal B

, 85:279

First online:

Superconductivity at Tc = 44 K in LixFe2Se2(NH3)y

  • E. -W. ScheidtAffiliated withCPM, Institute of Physics, University of Augsburg
  • , V. R. HathwarAffiliated withCPM, Institute of Physics, University of Augsburg
  • , D. SchmitzAffiliated withCPM, Institute of Physics, University of Augsburg
  • , A. DunbarAffiliated withCPM, Institute of Physics, University of Augsburg
  • , W. SchererAffiliated withCPM, Institute of Physics, University of Augsburg
  • , F. MayrAffiliated withCenter for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg
  • , V. TsurkanAffiliated withCenter for Electronic Correlations and Magnetism, Institute of Physics, University of AugsburgInstitute of Applied Physics, Academy of Sciences of Moldova Email author 
  • , J. DeisenhoferAffiliated withCenter for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg
  • , A. LoidlAffiliated withCenter for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg

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Abstract

Following a recent proposal by Burrard-Lucas et al. [arXiv:1203.5046] we intercalated FeSe with Li in liquid ammonia. We report on the synthesis of new Li x Fe2Se2(NH3) y phases as well as on their magnetic and superconducting properties. We suggest that the superconducting properties of these new hybride materials appear not to be influenced by the presence of electronically-innocent Li(NH2) molecules. Indeed, high onset temperatures of 44 K and shielding fractions of almost 80% were only obtained in samples containing exclusively Li x (NH3) y moieties acting simultaneously as electron donors and spacer units. The c-axis lattice parameter of the new intercalated phases is strongly enhanced when compared to the alkali-metal intercalated iron selenides A1−x Fe2−y Se2 with A = K, Rb, Cs, Tl with T c = 32 K.

Keywords

Solid State and Materials