125Te-Mossbauer study of Fe1.1Te and FeTe0.5Se0.5 superconductor
125Te-Mossbauer study of Fe1.1Te and FeTe0.5Se0.5 superconductor
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Fe1.1Te和FeTe0.5Se0.5超导体的125Te-Mossbauer研究
DOI：
10.1007/s10751-019-1652-1
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Makoto Seto
中科院分区：
文献类型：
--
作者：
Shinji Kitao;Masayuki Kurokuzu;Yasuhiro Kobayashi;Makoto Seto
用~（125）Te-Mössbauer谱研究了铁基超导体的母体化合物Fe_（1.1）Te和掺Se的FeTe_（0.5）Se_（0.5）超导体。通过测量精确的温度依赖性的光谱，在Fe的反铁磁转变温度（TN）附近的Fe 1.1Te的不连续线加宽观察。虽然在两种样品中都观察到线宽随温度降低而变宽，但线宽的温度依赖性与无反冲分数的温度依赖性一样，假设德拜模型的德拜温度约为200 K。在~（57）Fe-Mössbauer谱中，Te的内磁场随温度的变化与Fe的内磁场随温度的变化相似，因此，Fe_（1.1）Te中的不连续附加谱线展宽可以看作是Te在TN以下的内磁场。因此，提出了Te和Fe的电子轨道杂化，Te的转移磁矩是通过Fe atTN的反铁磁序诱导的。
A parent compound of iron-based superconductor, Fe1.1Te, and a Se-doped superconductor, FeTe0.5Se0.5, were investigated using125Te-Mössbauer spectroscopy. By measuring precise temperature dependence of the spectra, discontinuous line broadening in the Fe1.1Te near the antiferromagnetic transition temperature (TN) of Fe was observed. While the broadening of the line width were observed in both samples as the temperature decreases, the temperature dependences of the line width were well reproduced as that of the recoilless fraction, assuming the Debye model with a Debye temperature of about 200 K. The discontinuous additional line broadening in the Fe1.1Te can be considered as the internal magnetic fields of Te belowTN, since the temperature dependence of internal magnetic fields of Te is similar to that of Fe in57Fe-Mössbauer spectroscopy. Therefore, hybridization of the electronic orbital of Te and Fe was suggested and the transferred magnetic moment of Te was induced through the antiferromagnetic order of Fe atTN.