Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 7, Issue 9, Pages 1661-1666Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b00644
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- U.S.-Israel Binational Science Foundation [2010137]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1407435] Funding Source: National Science Foundation
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Variable-temperature scanning tunneling spectroscopy revealed a sharp Verwey transition in individual similar to 10 nm magnetite nanocrystals prepared by the coprecipitation technique and embedded in the surface of a gold film. The transition was observed as a significant change in the electronic structure around the Fermi level, with an apparent band gap of similar to 140-250 meV appearing below the transition temperature and a pseudogap of similar to 75 +/- 10 meV appearing above it. The transition temperature was invariably observed around 101 +/- 2 K for different nanocrystals, as opposed to 123 K typically reported for stoichiometric bulk crystals. This suggests that the lowering of the transition temperature is an intrinsic finite size effect, probably due to the presence of the surface.
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