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Low-energy planar magnetic defects in BaFe2As2: Nanotwins, twins, antiphase, and domain boundaries

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Title Low-energy planar magnetic defects in BaFe2As2: Nanotwins, twins, antiphase, and domain boundaries
 
Creator KHAN, SN
ALAM, A
JOHNSON, DD
 
Subject SUPERCONDUCTIVITY
PNICTIDES
 
Description 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.
 
Publisher AMER PHYSICAL SOC
 
Date 2014-10-16T06:40:09Z
2014-10-16T06:40:09Z
2013
 
Type Article
 
Identifier PHYSICAL REVIEW B, 88(18)
1098-0121
1550-235X
http://dx.doi.org/10.1103/PhysRevB.88.184515
http://dspace.library.iitb.ac.in/jspui/handle/100/15457
 
Language en