Extreme sensitivity of superconductivity to stoichiometry in Fe1+δSe
作者： T. M. McQueen , Q. Huang , V. Ksenofontov , C. Felser , Q. Xu
DOI: 10.1103/PHYSREVB.79.014522
关键词: Condensed matter physics 、 Superconductivity 、 Stoichiometry 、 Materials science 、 Instability 、 Arsenide
摘要: 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 Fe 1+ δ 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 Fe 1+ δ Se is not magnetically ordered down to 5 K. These results …
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