Superconductivity induced by ruthenium substitution in an iron arsenide: investigation of SrFe2-xRuxAs2 (0 <= x <= 2)

Abstract

The magnetism in SrFe2As2 can be suppressed by electron doping through a small substitution of Fe by Co or Ni, giving way to superconductivity. We demonstrate that a massive substitution of Fe by isovalent ruthenium similarly suppresses the magnetic ordering in SrFe2-xRuxAs2 and leads to bulk superconductivity for 0.6 <= x <= 0.8. Magnetization, electrical resistivity, and specific heat data show Tc up to approx 20K. Detailed structural investigations reveal a strong decrease of the lattice parameter ratio c/a with increasing x. DFT band structure calculations are in line with the observation that the magnetic order in SrFe2-xRuxAs2 is only destabilized for large x.

6 pages, 5 figures, extended and revised version

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• Superconductivity and magnetism in platinum-substituted SrFe2As2 single crystals
• Correlation-induced self-doping in intercalated iron-pnictide superconductor Ba2Ti2Fe2As4O
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• Structural and physical properties of layered oxy-arsenides LnRuAsO (Ln = La, Nd, Sm, Gd)
• K2Mo3As3 is a Multi-Gap Electron-Phonon Superconductor
• Lattice Parameters Guide Superconductivity in Iron-Arsenides
• Competing magnetic phases and field-induced dynamics in DyRuAsO
• Striking Zn impurity effect on the Fe-based superconductor BaFe1.87Co0.13As2
• Effect of Co doping and hydrostatic pressure on SrFe2As2