Journal
PHYSICAL REVIEW B
Volume 79, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.014522
Keywords
iron compounds; proximity effect (superconductivity); stoichiometry; superconducting materials
Funding
- U. S. Department of Energy
- Division of Basic Energy Sciences [DE-FG02-98ER45706]
- NSF MRSEC [DMR-0819860]
- National Science Foundation Graduate Research Fellowship
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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+delta 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+delta 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.
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