Magnetization distribution in the tetragonal Ba(Fe1−xCox)2As2, x=0.066 probed by polarized neutron diffraction

K. Prokeš; A. Gukasov; D. N. Argyriou; S. L. Bud'ko; P. C. Canfield; A. Kreyssig; A. I. Goldman

doi:10.1209/0295-5075/93/32001

All issues

Volume 93 / No 3 (February 2011)

EPL, 93 3 (2011) 32001

Abstract

Open Access

Issue		EPL Volume 93, Number 3, February 2011


Article Number		32001
Number of page(s)		5
Section		Nuclear Physics
DOI		https://doi.org/10.1209/0295-5075/93/32001
Published online		11 February 2011

EPL, 93 (2011) 32001

Magnetization distribution in the tetragonal Ba(Fe_1−xCo_x)₂As₂, x=0.066 probed by polarized neutron diffraction

K. Prokeš¹^a, A. Gukasov², D. N. Argyriou¹, S. L. Bud'ko³^,4, P. C. Canfield³^,4, A. Kreyssig³^,4 and A. I. Goldman³^,4

¹ 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

^a prokes@helmholtz-berlin.de

Received: 28 October 2010
Accepted: 17 January 2011

Abstract

Polarized neutron diffraction has been performed on a tetragonal Ba(Fe_{1− x}Co_x)₂As₂, x = 0.066 single crystal under an applied magnetic field of 6 T directed along the [ $\overline{1}10$ ] 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.

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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