Co-emergence of magnetic order and structural fluctuations in magnetite

We report high-temperature analysis of the local structure in magnetite, Fe3O4, which reveals that the low-temperature Verwey state (defined by charge ordering and trimeron bonding) persists (on a local scale) to an astonishing 850 K, the magnetic Curie temperature. This confirms that local Fe-Fe trimeron bonding arises due to magnetic ordering, far above their long-range observation (the Verwey transition).

Trimeron local ordering

G. Perversi, E. Pachoud, J. Cumby, J.M. Hudspeth, J.P. Wright, S.A.J. Kimber and J.P. Attfield, Co-emergence of magnetic order and structural fluctuations in magnetite, Nature Communications, 10, 2019, 2857.