Magnetization distribution in the tetragonal Ba(Fe1-xCox)(2)As-2, x=0.066 probed by polarized neutron diffraction

TitleMagnetization distribution in the tetragonal Ba(Fe1-xCox)(2)As-2, x=0.066 probed by polarized neutron diffraction
Publication TypeJournal Article
Year of Publication2011
AuthorsProkes K, Gukasov A, Argyriou DN, Bud'ko SL, Canfield PC, Kreyssig A, Goldman AI
Journal TitleEPI
Volume93
Pages32001
Date Published02
Type of ArticleArticle
ISBN Number0295-5075
Accession NumberISI:000287518600007
Keywordsiron, superconductivity
Abstract

Polarized neutron diffraction has been performed on a tetragonal Ba(Fe1-xCox)(2)As-2, x=0.066 single crystal under an applied magnetic field of 6 T directed along the [(1) over bar 10] direction to determine the magnetic structure factors of various Bragg reflections. The maximum entropy reconstruction based on bulk magnetization measurements and polarized neutron diffraction data reveal a small induced magnetic moment residing on the 4d Wyckoff site that is occupied by Fe/Co atoms. No significant magnetization density has been found on the Ba and As atomic positions. The small polarizability of Fe/Co sites leads to flipping ratios very close to 1.00. Our data suggest a non-zero orbital contribution to the Fe/Co magnetic form factor in good agreement with recent theoretical and experimental studies. Copyright (C) EPLA, 2011

URL<Go to ISI>://000287518600007
DOI10.1209/0295-5075/93/32001
Alternate JournalEpl