Nanoscale interlayer defects in iron arsenides
Abstract
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 Tc.
- Authors:
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[1];
[1];
[1];
[1];
[1];
[1];
[1];
[1]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1542220
- Alternate Identifier(s):
- OSTI ID: 1703265
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Solid State Chemistry
- Additional Journal Information:
- Journal Volume: 277; Journal Issue: C; Journal ID: ISSN 0022-4596
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; High-temperature superconductivity; Iron arsenide; Microscopy; Nanoscale defects
Citation Formats
Zheng, Qiang, Chi, Miaofang, Ziatdinov, Maxim, Li, Li, Maksymovych, Petro, Chisholm, Matt F., Kalinin, Sergei V., and Sefat, Athena S. Nanoscale interlayer defects in iron arsenides. United States: N. p., 2019.
Web. doi:10.1016/j.jssc.2019.06.040.
Zheng, Qiang, Chi, Miaofang, Ziatdinov, Maxim, Li, Li, Maksymovych, Petro, Chisholm, Matt F., Kalinin, Sergei V., & Sefat, Athena S. Nanoscale interlayer defects in iron arsenides. United States. https://doi.org/10.1016/j.jssc.2019.06.040
Zheng, Qiang, Chi, Miaofang, Ziatdinov, Maxim, Li, Li, Maksymovych, Petro, Chisholm, Matt F., Kalinin, Sergei V., and Sefat, Athena S. Sat .
"Nanoscale interlayer defects in iron arsenides". United States. https://doi.org/10.1016/j.jssc.2019.06.040. https://www.osti.gov/servlets/purl/1542220.
@article{osti_1542220,
title = {Nanoscale interlayer defects in iron arsenides},
author = {Zheng, Qiang and Chi, Miaofang and Ziatdinov, Maxim and Li, Li and Maksymovych, Petro and Chisholm, Matt F. and Kalinin, Sergei V. and Sefat, Athena S.},
abstractNote = {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 Tc.},
doi = {10.1016/j.jssc.2019.06.040},
journal = {Journal of Solid State Chemistry},
number = C,
volume = 277,
place = {United States},
year = {Sat Jun 29 00:00:00 EDT 2019},
month = {Sat Jun 29 00:00:00 EDT 2019}
}
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Figures / Tables:
Figure 1: Plane-view images of typical 122 iron arsenide in [001] projection. (a) Atomic resolution annular dark-field STEM image; white spots are columns of alternating Ba and As atoms, while gray spots are Fe. (b) SEM and (c) STM images of surface morphology, revealing step-like domains, in one cleaved surfacemore »
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.