Superconductivity in fluorine and yttrium co-doped SmFeAsO

Superconductivity in fluorine and yttrium co-doped SmFeAsO

Polycrystalline fluorine and yttrium co-doped SmFeAsO samples are synthesized by solid state sintering and their physical properties are studied. The lattice parameters of the Sm 1− y Y y FeAsO 0.8 F 0.2 samples decrease with the increasing y due to the smaller Y ions and the stiffness of the Y-O bo...

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Veröffentlicht in:Journal of applied physics 2012-05, Vol.111 (9), p.093912-093912-5
Hauptverfasser: Lai, K. T., Kwong, F. L., Ng, Dickon H. L.
Format: Artikel
Sprache:eng
Schlagworte:
Bonding
Bonding strength
Fluorine
Iron
Lattice parameters
Physical properties
Superconductivity
Yttrium
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Beschreibung
Zusammenfassung:Polycrystalline fluorine and yttrium co-doped SmFeAsO samples are synthesized by solid state sintering and their physical properties are studied. The lattice parameters of the Sm 1− y Y y FeAsO 0.8 F 0.2 samples decrease with the increasing y due to the smaller Y ions and the stiffness of the Y-O bond. The maximum critical temperature T c of the samples is at y = 0.05. This may be due to the fact that the strong interaction between Sm and Fe of the Fe-As bond is being re-disturbed by the doped Y ions.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4712309