Effect of antimony substitution in iron pnictide compounds

Preprint English OPEN
Schmidt, D. ; Braun, H. F. (2015)
  • Subject: Condensed Matter - Superconductivity

In the present study we have examined the effect of negative chemical pressure in iron pnictides. We have synthesized substitution series replacing arsenic by antimony in a number of 1111- and 122-iron arsenides and present their crystallographic and physical properties. The SDW transition temperature in LaFeAs$_{\mathrm{1-x}}$Sb$_{\mathrm{x}}$O decreases with increasing antimony content, while the superconducting transition temperature in LaFeAs$_{\mathrm{1-x}}$Sb$_{\mathrm{x}}$O$_{\mathrm{0.85}}$F$_{\mathrm{0.15}}$ initially increases with Sb substitution. 1111-compounds with samarium instead of lanthanum have a smaller unit cell volume. In these phases, no Sb solubility is observed. There is also no apparent solubility of antimony in the 122-iron arsenides.
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