Nanoscale phase separation in the iron chalcogenide superconductor K 0 . 8 Fe 1 . 6 Se 2 as seen via scanning nanofocused x-ray diffraction
By A. Ricci, N. Poccia, G. Campi, B. Joseph, G. Arrighetti, L. Barba, Michael Reynolds, M. Burghammer, H. Takeya, Y. Mizuguchi and 4 more. 2011
180 citations recorded by the source corpus.
Advanced synchrotron radiation focusing down to a size of 300 nm has been used to visualize nanoscale phase separation in the K${}_{0.8}$Fe${}_{1.6}$Se${}_{2}$ superconducting system using scanning nanofocus single-crystal x-ray diffraction. The results show an intrinsic phase separation in K${}_{0.8}$Fe${}_{1.6}$Se${}_{2}$ single crystals at $T$ 520 K, revealing the coexistence of (i) a magnetic phase characterized by an expanded lattice with superstructures due to Fe vacancy ordering and (ii) a nonmagnetic 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 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.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/b6440b615f0ca378e2a9fefb4682d5068ec2b8db
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In Condensed Matter Physics
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Colloquium: The unexpected properties of alkali metal iron selenide superconductors (2012, background): “The figure illustrates the several lengths scales involved in the phase separated state, resembling those found in other compounds such as cuprates and manganites (Ricci et al., 2011a).”