通过扫描纳米聚焦X射线衍射观察铁硫族化物超导体K0.8Fe 1.6Se 2中的纳米尺度相分离
Nanoscale phase separation in the iron chalcogenide superconductor K0.8Fe1.6Se2 as seen via scanning nanofocused x-ray diffraction
摘要：
先进的同步辐射聚焦到300 nm的尺寸已被用于可视化纳米级相分离的K0.8Fe1.6Se2超导系统使用扫描纳米焦点单晶X射线衍射。结果表明，在T< 520 K时，K0.8Fe1.6Se2单晶中存在本征相分离，表明磁性相和非磁性相共存，磁性相的特征是由于Fe空位有序化导致的超结构晶格膨胀，非磁性相的特征是面内压缩晶格。在300 K时两相的空间分布显示出相分离的受阻或停滞性质。相分离的空间分辨成像使我们能够提供小于300 nm的纳米相畴和不同微米尺寸的区域的直接证据，这些区域具有形成两相的多尺度复杂网络的磁性或磁性畴。
英文摘要：
Advanced synchrotron radiation focusing down to a size of 300 nm has been used to visualize nanoscale phase separation in the K0.8Fe1.6Se2 superconducting system using scanning nanofocus single-crystal X-ray diffraction. The results show an intrinsic phase separation in K0.8Fe1.6Se2 single crystals at T< 520 K, revealing coexistence of i) a magnetic phase characterized by an expanded lattice with superstructures due to Fe vacancy ordering and ii) a non-magnetic phase with an in-plane compressed lattice. The spatial distribution of the two phases at 300 K shows a frustrated or arrested nature of the phase separation. The space-resolved imaging of the phase separation permitted us to provide a direct evidence of nanophase domains smaller than 300 nm and different micrometer-sized regions with percolating magnetic or nonmagnetic domains forming a multiscale complex network of the two phases.
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