Discovery of the soft electronic modes of the trimeron order in magnetite
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27740%2F20%3A10244892" target="_blank" >RIV/61989100:27740/20:10244892 - isvavai.cz</a>
Výsledek na webu
<a href="https://www.nature.com/articles/s41567-020-0823-y#article-info" target="_blank" >https://www.nature.com/articles/s41567-020-0823-y#article-info</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41567-020-0823-y" target="_blank" >10.1038/s41567-020-0823-y</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Discovery of the soft electronic modes of the trimeron order in magnetite
Popis výsledku v původním jazyce
Spectroscopic study of the low-energy excitations in magnetite Fe3O4 shows the signatures of its charge-ordered structure involved in the metal-insulator transition, whose building blocks are the three-site small polarons, termed trimerons. The Verwey transition in magnetite (Fe3O4) is the first metal-insulator transition ever observed(1) and involves a concomitant structural rearrangement and charge-orbital ordering. Owing to the complex interplay of these intertwined degrees of freedom, a complete characterization of the low-temperature phase of magnetite and the mechanism driving the transition have long remained elusive. It was demonstrated in recent years that the fundamental building blocks of the charge-ordered structure are three-site small polarons called trimerons(2). However, electronic collective modes of this trimeron order have not been detected to date, and thus an understanding of the dynamics of the Verwey transition from an electronic point of view is still lacking. Here, we discover spectroscopic signatures of the low-energy electronic excitations of the trimeron network using terahertz light. By driving these modes coherently with an ultrashort laser pulse, we reveal their critical softening and hence demonstrate their direct involvement in the Verwey transition. These findings shed new light on the cooperative mechanism at the origin of magnetite's exotic ground state.
Název v anglickém jazyce
Discovery of the soft electronic modes of the trimeron order in magnetite
Popis výsledku anglicky
Spectroscopic study of the low-energy excitations in magnetite Fe3O4 shows the signatures of its charge-ordered structure involved in the metal-insulator transition, whose building blocks are the three-site small polarons, termed trimerons. The Verwey transition in magnetite (Fe3O4) is the first metal-insulator transition ever observed(1) and involves a concomitant structural rearrangement and charge-orbital ordering. Owing to the complex interplay of these intertwined degrees of freedom, a complete characterization of the low-temperature phase of magnetite and the mechanism driving the transition have long remained elusive. It was demonstrated in recent years that the fundamental building blocks of the charge-ordered structure are three-site small polarons called trimerons(2). However, electronic collective modes of this trimeron order have not been detected to date, and thus an understanding of the dynamics of the Verwey transition from an electronic point of view is still lacking. Here, we discover spectroscopic signatures of the low-energy electronic excitations of the trimeron network using terahertz light. By driving these modes coherently with an ultrashort laser pulse, we reveal their critical softening and hence demonstrate their direct involvement in the Verwey transition. These findings shed new light on the cooperative mechanism at the origin of magnetite's exotic ground state.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10300 - Physical sciences
Návaznosti výsledku
Projekt
Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2020
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Nature Physics
ISSN
1745-2473
e-ISSN
—
Svazek periodika
16
Číslo periodika v rámci svazku
5
Stát vydavatele periodika
GB - Spojené království Velké Británie a Severního Irska
Počet stran výsledku
8
Strana od-do
"541–545"
Kód UT WoS článku
000518737400005
EID výsledku v databázi Scopus
2-s2.0-85081649581