Oxygen-annealing effects on superconductivity in polycrystalline Fe1+xTe1-ySey
Oxygen-annealing effects on superconductivity in polycrystalline Fe1+xTe1-ySey
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DOI：
10.1088/0953-2048/28/9/095005
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发表时间：
2015-09-01
影响因子：
3.6
通讯作者：
Johrendt, Dirk
中科院分区：
文献类型：
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作者：
Friederichs, Gina M.;Woersching, Matthias P. B.;Johrendt, Dirk
反PbO型铁硫系化合物Fe1+xTe1-ySey(x=0，0.1，y=0.1-0.4)的超导电性与位于FeTe1-ySey层之间的间隙铁原子量(X)有关。标称为Fe1.1Te1-ySey的非超导样品在300摄氏度的氧气气氛中热处理后，转变为临界温度高达14K的超导体。这一过程在随后的氢气退火时是不可逆的。磁性测量与铁氧化物的形成一致，表明氧退火优先从Fe1+xTe1-ySey中提取间隙铁，这干扰了超导电性。
Superconductivity in anti-PbO-type iron chalcogenides Fe1+xTe1-ySey (x=0, 0.1, y=0.1-0.4) depends on the amount (x) of interstitial iron atoms located between the FeTe1-ySey layers. Non-superconducting samples of nominal Fe1.1Te1-ySey convert to superconductors with critical temperatures up to 14 K after annealing at 300 degrees C in an oxygen atmosphere. The process is irreversible upon subsequent hydrogen annealing. Magnetic measurements are consistent with the formation of iron oxides, suggesting that oxygen annealing preferably extracts interstitial iron from Fe1+xTe1-ySey, which interferes with superconductivity.