57Fe Mössbauer spectroscopic studies of single-crystalline KxFe2-yS2 and KxFe2-ySe2

被引：0
作者：
Yuu Tsuchiya
Shugo Ikeda
Hisao Kobayashi
机构：
[1] University of Hyogo,
来源：
Hyperfine Interactions | 2016年 / 237卷
关键词：
Iron-based superconductor; Phase separation; Mössbauer spectroscopy;
D O I：
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摘要：
We have investigated the physical properties of single-crystalline KxFe2-yS2 and KxFe2-ySe2 samples using 57Fe Mössbauer spectroscopy. The observed 57Fe Mössbauer spectra were reconstructed using a major antiferromagnetic ordered K2Fe4Se5 phase and a minor paramagnetic phase down to 5 K, despite being superconducting below 32.2 K in KxFe2-ySe2. The analysis of 57Fe Mössbauer spectrum for KxFe2-yS2 at 290 K confirms the presence of a major antiferromagnetic ordered K2Fe4S5 phase and a minor paramagnetic phase in the KxFe2-yS2 single crystal. The derived hyperfine interaction parameters of the paramagnetic phase in KxFe2-yS2 suggest that the microstructure of this phase in KxFe2-yS2 is similar to that of the superconducting phase in KxFe2-ySe2 although the KxFe2-yS2 single crystals exhibit no superconductivity down to 5 K.
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