Magnetic frustration in an iron based Cairo pentagonal lattice

Details Magnetic frustration in an iron based Cairo pentagonal lattice Magnetic frustration in an iron based Cairo pentagonal lattice

2010-01-05

arxiv.org/abs/1001.0710v1

Physical Review Letters 103 (2009) 267204

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.103.267204

The Fe3+ lattice in the Bi2Fe4O9 compound is found to materialize the ?rst analogue of a magnetic pentagonal lattice. Due to its odd number of bonds per elemental brick, this lattice, subject to ?rst neighbor antiferromagnetic interactions, is prone to geometric frustration. The Bi2Fe4O9 magnetic properties have been investigated by macroscopic magnetic measurements and neutron diffraction. The observed non-collinear magnetic arrangement is related to the one stabilized on a perfect tiling as obtained from a mean ?eld analysis with direct space magnetic con?gurations calculations. The peculiarity of this structure arises from the complex connectivity of the pentagonal lattice, a novel feature compared to the well-known case of triangle-based lattices.

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