The stoichiometry of FeSe

Tetragonal iron selenide, FeSe, the layered parent compound of the recently discovered superconducting arsenide family, has previously been shown to be non-magnetic and superconducting with a critical temperature near 8 K. There has, however, been a lack of consensus as to whether selenium vacancies...

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Bibliographic Details
Published in:Solid state communications 2009-10, Vol.149 (37), p.1507-1509
Main Authors: Williams, A.J., McQueen, T.M., Cava, R.J.
Format: Article
Language:English
Subjects:
A. Superconductors
B. Chemical synthesis
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Effects of material synthesis, crystal structure, and chemical composition
Exact sciences and technology
Physics
Superconductivity
Transition temperature variations
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Summary:Tetragonal iron selenide, FeSe, the layered parent compound of the recently discovered superconducting arsenide family, has previously been shown to be non-magnetic and superconducting with a critical temperature near 8 K. There has, however, been a lack of consensus as to whether selenium vacancies present due to large deviations from ideal stoichiometry are required to give rise to the superconductivity. Here we describe the results of experiments that demonstrate simply that superconducting iron selenide can only be synthesized as a pure material when near stoichiometric (i.e. FeSe). Significant selenium deficiency or excess gives rise to secondary magnetic phases, and a suppression of the superconductivity.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2009.07.011