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

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2011-02-11
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Prokeš, K.
Gukasov, A.
Argyriou, D. N.
Bud’ko, Sergey
Kreyssig, Andreas
Goldman, Alan
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Canfield, Paul
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

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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.

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This article is published as Prokeš, K., A. Gukasov, D. N. Argyriou, S. L. Bud'ko, P. C. Canfield, A. Kreyssig, and A. I. Goldman. "Magnetization distribution in the tetragonal Ba (Fe1− xCox) 2As2, x= 0.066 probed by polarized neutron diffraction." EPL (Europhysics Letters) 93, no. 3 (2011): 32001. DOI: 10.1209/0295-5075/93/32001. Posted with permission.

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Sat Jan 01 00:00:00 UTC 2011
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