Physics – Condensed Matter – Materials Science
Scientific paper
2011-03-15
Phys. Rev. B 83, 214402 (2011)
Physics
Condensed Matter
Materials Science
11 pages, 8 figures, 8 tables
Scientific paper
10.1103/PhysRevB.83.214402
The spiral magnetic structure and underlying spin lattice of BiMnFe2O6 are investigated by low-temperature neutron powder diffraction and density functional theory band structure calculations. In spite of the random distribution of the Mn3+ and Fe3+ cations, this compound undergoes a transition into an incommensurate antiferromagnetically ordered state below TN ~ 220 K. The magnetic structure is characterized by the propagation vector k=[0,beta,0] with beta ~ 0.14 and the P22_12_11'(0 \beta 0)0s0s magnetic superspace symmetry. It comprises antiferromagnetic helixes propagating along the b-axis. The magnetic moments lie in the ac plane and rotate about pi*(1+beta) ~ 204.8 deg angle between the adjacent magnetic atoms along b. The spiral magnetic structure arises from the peculiar frustrated arrangement of exchange couplings in the ab plane. The antiferromagnetic coupling along the c-axis leads to the cancellation of electric polarization, and results in the lack of ferroelectricity in BiMnFe2O6.
Abakumov Artem M.
Greenblatt Martha
Perez-Mato Juan Manuel
Petricek Vaclav
Rosner Helge
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