|Title:||Jahn-Teller distortion driven magnetic polarons in magnetite||Authors:||Wang, R. P.
Li, Z. Y.
Wu, W. B.
Jeng, H. T.
Huang, D. J.
Huang, H. Y.
Chen, Z. Y.
Zhou, J. S.
Chen, C. T.
|Issue Date:||29-Jun-2017||Journal Volume:||8||Source:||Nature Communications||Abstract:||
© The Author(s) 2017. 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 Fe2+ and Fe3+ states. Comparison of the experimental results with crystal-field multiplet calculations shows that the spin-orbital dd excitons of the Fe2+ sites arise from a tetragonal Jahn-Teller active polaronic distortion of the Fe2+ O6 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.
|Appears in Collections:||物理學系|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.