Extreme sensitivity of superconductivity to stoichiometry in Fe1+δSe
By T. McQueen, Qingzhen Huang, V. Ksenofontov, C. Felser, Qiang Xu, H. W. Zandbergen, Y. Hor, J. M. Allred, A. Williams, Dongxia Qu and 3 more. 2008
510 citations recorded by the source corpus.
The recently discovered iron arsenide superconductors appear to display a universal set of characteristic features, including proximity to a magnetically ordered state and robustness of the superconductivity in the presence of disorder. Here we show that superconductivity in Fe1+?Se, which can be considered the parent compound of the superconducting arsenide family, is destroyed by very small changes in stoichiometry. Further, we show that nonsuperconducting Fe1+?Se is not magnetically ordered down to 5 K. These results suggest that robust superconductivity and immediate instability against an ordered magnetic state should not be considered as intrinsic characteristics of iron-based superconducting systems.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Molecular Biology
View Paper: https://www.semanticscholar.org/paper/021dd10e81732a3a33b789c8d505b492af8f90f6
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In Condensed Matter Physics
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Superconductivity in iron compounds (2011, background): “11: McQueen et al. (2009a) performed a careful study of Tc in Fe1þ Se with Fe content variation and found that ‘‘stoichiometric’’ Fe1þ Se, when made single phase, has ¼ 0:01 and Tc ¼ 8:5 K, while for ¼ 0:03, Tc is below 0.6 K. Mizuguchi et al. (2009) studied FeSe doping with Te and S on the Se site…”