Phase Separation and Chemical Inhomogeneity in the Iron Chalcogenide Superconductor Fe1+yTexSe1-x
Hefei Hu, J. M. Zuo, J. S. Wen, Z. J. Xu, Z. W. Lin, Q. Li, Genda Gu,, W. K. Park, and L. H. Greene
TL;DR
This study investigates nanoscale phase separation and chemical inhomogeneity in Fe1+yTexSe1-x superconductors using STEM and EELS, revealing a miscibility gap and minor Te content fluctuations.
Contribution
It provides detailed nanoscale analysis of phase separation and chemical inhomogeneity in Fe-based superconductors, highlighting the role of a miscibility gap.
Findings
Both superconducting and nonsuperconducting samples show nanoscale phase separation.
Te/Se content varies by about 20% or less from nominal compositions.
Chemical inhomogeneity is linked to a miscibility gap in the material.
Abstract
We report investigation on Fe1+yTexSe1-x single crystals by using scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS). Both nonsuperconducting samples with excess iron and superconducting samples demonstrate nanoscale phase separation and chemical inhomogeneity of Te/Se content, which we attribute to a miscibility gap. The line scan EELS technique indicates ~20% or less fluctuation of Te concentration from the nominal compositions.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.