Non-collinear antiferromagnetism in FeCrAs

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Journal titleCanadian Journal of Physics
Pages701706; # of pages: 6
AbstractFeCrAs undergoes a magnetic ordering transition at TN ≃ 125 K. The magnetic structure of FeCrAs, which crystallizes in space group P62m and is isostructural to Fe₂P, was determined by constant wavelength neutron powder diffraction. A single basis function was found to describe the intensity distribution in the magnetic satellite reflections, which are associated with propagation vector k = (1/3, 1/3, 0), representing a K-point zone-boundary ordering. The magnetic intensity could be modelled by moments from Cr only, which lie on the 3g-sites, in pyramidal coordination by As, whereas the moments on Fe, in tetrahedral coordination on the 3f-sites, were found to be so small as to be zero within error. This agrees with previous Mössbauer spectroscopy measurements on this compound. The magnetic structure is characterized by non-collinear antiferromagnetic order of the moments, all of which lie in the hexagonal plane. This does not appear to have been observed in other monopnictides with Fe₂P structure but is consistent with geometric frustration of antiferromagnetic interactions.
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AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
Peer reviewedYes
NPARC number16984050
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Record identifierfc9d2ad1-bd8b-4fad-b542-d16c018e707e
Record created2011-03-08
Record modified2016-05-09
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