Title
Low-energy planar magnetic defects in BaFe2As2: Nanotwins, twins, antiphase, and domain boundaries
Document Type
Article
Publication Version
Published Version
Publication Date
11-1-2013
Journal or Book Title
Physical Review B
Volume
88
Issue
18
First Page
184515
DOI
10.1103/PhysRevB.88.184515
Abstract
In BaFe2As2, structural and magnetic planar defects begin to proliferate below the structural phase transition, affecting descriptions of magnetism and superconductivity. We study, using density-functional theory, the stability and magnetic properties of competing antiphase and domain boundaries, twins and isolated nanotwins (twin nuclei), and spin excitations proposed and/or observed. These nanoscale defects have a very low surface energy (22–210 m Jm−2), with twins favorable to the mesoscale. Defects exhibit smaller moments confined near their boundaries—making a uniform-moment picture inappropriate for long-range magnetic order in real samples. Nanotwins explain features in measured pair distribution functions so should be considered when analyzing scattering data. All these defects can be weakly mobile and/or can have fluctuations that lower assessed “ordered” moments from longer spatial and/or time averaging and should be considered directly.
Copyright Owner
American Physical Society
Copyright Date
2013
Language
en
File Format
application/pdf
Recommended Citation
Khan, Suffian N.; Alam, Aftab; and Johnson, Duane D., "Low-energy planar magnetic defects in BaFe2As2: Nanotwins, twins, antiphase, and domain boundaries" (2013). Ames Laboratory Publications. 279.
https://lib.dr.iastate.edu/ameslab_pubs/279
Included in
Condensed Matter Physics Commons, Engineering Physics Commons, Materials Science and Engineering Commons
Comments
This article is from Phys. Rev. B 88, 184515 (2013), doi:10.1103/PhysRevB.88.184515. Posted with permission.