Size Dependence of Metal−Insulator Transition in Stoichiometric Fe3O4 Nanocrystals

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Title
Size Dependence of Metal−Insulator Transition in Stoichiometric Fe3O4 Nanocrystals
Author(s)
Jisoo Lee; Soon Gu Kwon; Je-Geun Park; Taeghwan Hyeon
Publication Date
2015-07
Journal
NANO LETTERS, v.15, no.7, pp.4337 - 4342
Publisher
AMER CHEMICAL SOC
Abstract
Magnetite (Fe3O4) is one of the most actively studied materials with a famous metal.insulator transition (MIT), so-called the Verwey transition at around 123 K. Despite the recent progress in synthesis and characterization of Fe3O4 nanocrystals (NCs), it is still an open question how the Verwey transition changes on a nanometer scale. We herein report the systematic studies on size dependence of the Verwey transition of stoichiometric Fe3O4 NCs. We have successfully synthesized stoichiometric and uniform-sized Fe3O4 NCs with sizes ranging from 5 to 100 nm. These stoichiometric Fe3O4 NCs show the Verwey transition when they are characterized by conductance, magnetization, cryo-XRD, and heat capacity measurements. The Verwey transition is weakly size-dependent and becomes suppressed in NCs smaller than 20 nm before disappearing completely for less than 6 nm, which is a clear, yet highly interesting indication of a size effect of this well-known phenomena. Our current work will shed new light on this ages-old problem of Verwey transition. © XXXX American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/1964
ISSN
1530-6984
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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