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Effects of the sintering atmosphere on the superconductivity of SmFeAsO1-xFx compounds

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arxiv 1102.5571 v1 pith:MAPHDYSS submitted 2011-02-28 cond-mat.supr-con

classification cond-mat.supr-con
keywords atmosphereeffectsoxygensinteringsmfeaso1-xfxsuperconductivitywerequartz
verification ladder T0 review T1 audit T2 compute T3 formal
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A series of SmFeAsO1-xFx samples were sintered in quartz tubes filled with air of different pressures. The effects of the sintering atmosphere on the superconductivity were systematically investigated. The SmFeAsO1-xFx system maintains a transition temperature (Tc) near 50 K until the concentration of oxygen in quartz tubes increases to a certain threshold, after which Tc decreases dramatically. Fluorine losses, whether due to vaporization, reactions with starting materials, and reactions with oxygen, proved to be detrimental to the superconductivity of this material. The deleterious effects of the oxygen in the sintering atmosphere were also discussed in detail.

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