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Huang, H Y; Chen, Z Y; Wang, R-P; de Groot, F M F; Wu, W B; Okamoto, J; Chainani, A; Singh, A; Li, Z-Y; Zhou, J-S; Jeng, H-T; Guo, G Y; Park, Je-Geun; Tjeng, L H; Chen, C T; Huang, D J
Nature communications, 06/2017, Letnik: 8, Številka: 1Journal Article
The first known magnetic mineral, magnetite, has unusual properties, which have fascinated mankind for centuries; it undergoes the Verwey transition around 120 K with an abrupt change in structure and electrical conductivity. The mechanism of the Verwey transition, however, remains contentious. Here we use resonant inelastic X-ray scattering over a wide temperature range across the Verwey transition to identify and separate out the magnetic excitations derived from nominal Fe and Fe states. Comparison of the experimental results with crystal-field multiplet calculations shows that the spin-orbital dd excitons of the Fe sites arise from a tetragonal Jahn-Teller active polaronic distortion of the Fe O octahedra. These low-energy excitations, which get weakened for temperatures above 350 K but persist at least up to 550 K, are distinct from optical excitations and are best explained as magnetic polarons.
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