Physics and Astronomy, Ames Laboratory
Journal or Book Title
EPL (Europhysics Letters)
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.
Europhysics Letters Association
Prokeš, K.; Gukasov, A.; Argyriou, D. N.; Bud’ko, Sergey L.; Canfield, Paul C.; Kreyssig, Andreas; and Goldman, Alan I., "Magnetization distribution in the tetragonal Ba(Fe1-xCox)(2)As-2, x=0.066 probed by polarized neutron diffraction" (2011). Physics and Astronomy Publications. 659.