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Jahn-Teller distortion driven magnetic polarons in magnetite

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Title
Jahn-Teller distortion driven magnetic polarons in magnetite
Author(s)
H.Y. Huang; Z.Y. Chen; R.-P. Wang; F.M.F. de Groot; W.B. Wu; J. Okamoto; A. Chainani; A. Singh; Z.-Y. Li; J.-S. Zhou; H.-T. Jeng; G.Y. Guo; Je-Geun Park; L.H. Tjeng; C.T. Chen; D.J. Huang
Publication Date
2017-06
Journal
NATURE COMMUNICATIONS, v.8, no., pp.15929 -
Publisher
NATURE PUBLISHING GROUP
Abstract
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 þ and Fe3 þ states. Comparison of the experimental results with crystal-field multiplet calculations shows that the spin–orbital dd excitons of the Fe2 þ sites arise from a tetragonal Jahn-Teller active polaronic distortion of the Fe2 þ 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. (c) The Author(s) 2017
URI
http://pr.ibs.re.kr/handle/8788114/4118
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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