Magnetic frustration in an iron based Cairo pentagonal lattice
Eric Ressouche (SPSMS), Virginie Simonet (NEEL), Benjamin Canals, (NEEL), Marin Gospodinov, Vassil Skumryev (ICREA)
TL;DR
This paper reports the discovery of the first magnetic pentagonal lattice in Bi2Fe4O9, revealing complex frustration effects and non-collinear magnetic order due to its unique pentagonal connectivity.
Contribution
It introduces a novel pentagonal lattice structure in a magnetic material and analyzes its frustrated magnetic properties using experimental and theoretical methods.
Findings
Identification of a pentagonal lattice in Bi2Fe4O9
Observation of non-collinear magnetic order
Analysis of geometric frustration effects
Abstract
The Fe3+ lattice in the Bi2Fe4O9 compound is found to materialize the first analogue of a magnetic pentagonal lattice. Due to its odd number of bonds per elemental brick, this lattice, subject to first 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 field analysis with direct space magnetic configurations 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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