Spin ordering in a lattice of separated FeO$_4$ tetrahedra: case of Ba$_2$YFeO$_5$
Résumé
The magnetic structure of Ba2YFeO5 below TN (~ 5.5 K) is established on the basis of powder neutron diffraction. The only magnetic species in this compound is Fe 3+ , which is distributed onto a 3D framework of FeO4 tetrahedra separated by YO6 octahedra. The leading magnetic interaction is the super-super-exchange (SSE) between Fe 3+ cations via two O 2-anions. The magnetic structure can be described by an alternation of two types of corrugated layers carrying spins being "up" or "down" along a certain direction. This ordering is discussed in connection with the topology and relative strengths of the main SSE couplings. It is found that additional mechanisms, such as crystal-field effects and dipolar interactions, likely come into play to achieve the observed spin order.
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