Nanoscale interlayer defects in iron arsenides

Zheng, Qiang; Chi, Miaofang; Ziatdinov, Maxim; Li, Li; Maksymovych, Petro; Chisholm, Matt F.; Kalinin, Sergei V.; Sefat, Athena S.

doi:10.1016/j.jssc.2019.06.040

Nanoscale interlayer defects in iron arsenides

Journal Article · Sat Jun 29 00:00:00 EDT 2019 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2019.06.040· OSTI ID:1542220

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Using a local real-space microscopy probe, we investigate evidence of nanoscale interlayer defects along the c-crystallographic direction in BaFe₂As₂ (‘122’) based iron-arsenide superconductors. We find ordered 122 atomic arrangements within the ab-plane, and within regions of ~10 to 20 nm size perpendicular to this plane. While the FeAs substructure is very rigid, Ba ions are relatively weakly bound and can be displaced from the 122, forming stacking faults resulting in the physical separation of the 122 between adjacent ordered domains. The evidence for interlayer defects between the FeAs superconducting planes gives perspective on the minimal connection between interlayer chemical disorder and high-temperature superconductivity. Specifically, the Cooper pairs may be finding a way around such localized interlayer defects through a percolative path of the ordered layered 122 lattice that may not affect T_c.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1542220

Alternate ID(s):: OSTI ID: 1703265

Journal Information:: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: C Vol. 277; ISSN 0022-4596

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Iron arsenide
Microscopy
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Nanoscale interlayer defects in iron arsenides

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References (19)

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