Volume 93, Number 3, February 2011
|Number of page(s)||5|
|Published online||11 February 2011|
Magnetization distribution in the tetragonal Ba(Fe1−xCox)2As2, x=0.066 probed by polarized neutron diffraction
Helmholtz-Zentrum Berlin für Materialien und Energy - Hahn-Meitner-Platz 1, 14109 Berlin, Germany, EU
2 Laboratoire Léon Brillouin CEA-Saclay - Gif-sur-Yvette 91191, France, EU
3 Ames Laboratory, U.S. DOE, Iowa State University - Ames, IA 50011, USA
4 Department of Physics and Astronomy, Iowa State University - Ames, IA 50011, USA
Accepted: 17 January 2011
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.
PACS: 25.40.Dn – Elastic neutron scattering / 75.25.-j – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.) / 74.70.Xa – Pnictides and chalcogenides
© EPLA, 2011
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