Wang, Wei;
Li, Jun;
Liang, Zhixiu;
Wu, Lijun;
Lozano, Pedro M;
Komarek, Alexander C;
Shen, Xiaozhe;
... Tao, Jing; + view all
(2023)
Verwey transition as evolution from electronic nematicity to trimerons via electron-phonon coupling.
Science Advances
, 9
(23)
, Article eadf8220. 10.1126/sciadv.adf8220.
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Abstract
Understanding the driving mechanisms behind metal-insulator transitions (MITs) is a critical step toward controlling material's properties. Since the proposal of charge order-induced MIT in magnetite Fe3O4 in 1939 by Verwey, the nature of the charge order and its role in the transition have remained elusive. Recently, a trimeron order was found in the low-temperature structure of Fe3O4; however, the expected transition entropy change in forming trimeron is greater than the observed value, which arises a reexamination of the ground state in the high-temperature phase. Here, we use electron diffraction to unveil that a nematic charge order on particular Fe sites emerges in the high-temperature structure of bulk Fe3O4 and that, upon cooling, a competitive intertwining of charge and lattice orders arouses the Verwey transition. Our findings discover an unconventional type of electronic nematicity in correlated materials and offer innovative insights into the transition mechanism in Fe3O4 via the electron-phonon coupling.
| Type: | Article |
|---|---|
| Title: | Verwey transition as evolution from electronic nematicity to trimerons via electron-phonon coupling |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1126/sciadv.adf8220 |
| Publisher version: | https://doi.org/10.1126/sciadv.adf8220 |
| Language: | English |
| Additional information: | Copyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). |
| Keywords: | Electrons, Phonons, Cold Temperature, Electronics, Entropy |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10172293 |
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