57Fe Nuclear Resonant Inelastic Scattering of Fe1.1Te
57Fe Nuclear Resonant Inelastic Scattering of Fe1.1Te
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Fe1.1Te 57Fe 核共振非弹性散射
DOI：
10.1007/s10751-017-1484-9
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
M. Seto
中科院分区：
文献类型：
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作者：
M. Kurokuzu S. Kitao;Y. Kobayashi;M. Saito;R. Masuda;T. Mitsui,Y. Yoda;M. Seto
本文报道了Fe_（1.1）Te中~（57）Fe穆斯堡尔谱和核共振非弹性散射的研究结果。从观测到的光谱中提取了Fe的部分声子态密度（PDOS）。在65 K附近的四方-单斜相转变没有观察到可检测的变化。因此，通过结构转变的晶格常数和/或畸变的FeTe 4四面体的变化是微小的。根据观测到的Fe-PDOS，在10 K时的兰姆-穆斯堡尔因子为0.90（3），德拜温度被评估为300（10）K。在~（57）Fe穆斯堡尔谱中，在Néel温度以下测得了清晰的磁分裂。所得到的值的同质异能素位移显示的Fe 2+物种的特性和明显的差异观察到的相变的四极分裂（QS）的温度依赖性。QS的变化必然是由Fe位周围电荷密度分布的实质性变化引起的。这表明Fe-Te键的能带结构或性质变得高度各向异性。这些结果可能会提供有关FeTe 1 − xSex超导性各自机制的更多信息。
This study reports results of57Fe Mössbauer spectroscopy and nuclear resonant inelastic scattering (NRIS) in Fe1.1Te. The Fe-specific partial phonon densities of states (PDOSs) were extracted from the observed spectra. No detectable change at the tetragonal-monoclinic phase transition around 65 K was observed. Therefore the variations in lattice constants and/or distortion in FeTe4tetrahedron through the structural transition was minute. From the observed Fe-PDOS, the Lamb-Mössbauer factor was 0.90(3) at 10 K and the Debye temperature was evaluated as 300(10) K. In57Fe Mössbauer spectroscopy, the clear magnetic spittings of spectra were measured below Néel temperature. The obtained values of isomer shifts showed characteristics of Fe2+species and clear difference with the phase transition was observed in temperature dependence of quadrupole splitting (QS). The change of QS must be caused by substantial change of the charge density distribution around the Fe site. This suggests that the band structure or the nature of the Fe-Te bonds becomes highly anisotropic. These results might provide additional information about the respective mechanisms for FeTe1−xSexsuperconductivity.