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Polarized neutron diffraction has been performed on a tetragonal Ba(Fe1−xCox)2As2, x=0.066 single crystal under an applied magnetic field of 6 T directed along the [] 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

Magnetization distribution in the tetragonal Ba(Fe 1−x Co x ) 2 As 2 , x=0.066 probed by polarized neutron diffraction