Extreme sensitivity of superconductivity to stoichiometry in Fe1+?Se

Journal article (2009)
Department
Kavli Institute of Nanoscience (AS) (TU Delft)
Copyright: © 2009 The Authors ; American Physical Society
DOI: https://doi.org/doi:10.1103/PhysRevB.79.014522
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Published Date

29-01-2009

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Source:

Physical Review B, 79 (1), 2009

ISSN:

0163-1829

Faculty

Applied Sciences

Department

Kavli Institute of Nanoscience

Abstract

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.