Abstract
Single crystals of Na1−δ (Fe1−x T x )As with T = Pd, Ni, Cr, and Mn were investigated by magnetic susceptibility, specific heat, and electronic transport measurements. The structural and spin density wave phase transitions are completely suppressed when Fe in NaFeAs is substituted by those different heterovalent dopings. While superconductivity is only observed for formal electron doping (viz. by substituting Fe with either Pd or Ni), a non-superconducting phase down to 1.8 K is achieved by formal hole doping when Fe is substituted by Cr or Mn in NaFeAs along with the formation of a magnetic phase. This magnetic phase has also strong impact on the material properties.
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Acknowledgments
This work has been supported by the Deutsche Forschungsgemeinschaft through the Priority Program SPP1458 (BU887/15), the Emmy Noether Program WU595/3-1, as well as the ERA.Net RUS project FeSuCo. I.M. thanks funding from RFBR (12-03-01143-a).
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Steckel, F., Beck, R., Roslova, M. et al. Characterization of Doped Na(Fe1−x T x )As Single Crystals with T = Pd, Ni, Cr, and Mn. J Supercond Nov Magn 28, 1123–1127 (2015). https://doi.org/10.1007/s10948-014-2748-0
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DOI: https://doi.org/10.1007/s10948-014-2748-0