Observation of the Verwey transition in Fe3O4 nanocrystals

Gil Markovich*, Tcipi Fried, Pankaj Poddar, Amos Sharoni, David Katz, Tommer Wizansky, Oded Millo

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

The electronic properties of arrays and isolated magnetite nanocrystals were studied using tunneling spectroscopy. Macroscopic tunnel junctions were used to study stacked arrays of the nanocrystals. The temperature dependent resistance measurements showed an abrupt increase of the resistance around 100 K, attributed to the Verwey metal-insulator transition, while the current-voltage characteristics exhibit a sharp transition from an insulator gap to a peak in the density of states near the Fermi energy. This conductance peak was sensitive to in-plane magnetic field showing large magnetoresistance. The tunneling spectra obtained on isolated particles using a Scanning Tunneling Microscope exhibit a gap-like structure below the transition temperature that gradually disappeared with increasing temperature, ending with a small peak structure around zero bias.

Original languageEnglish
Pages (from-to)151-156
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume746
DOIs
StatePublished - 2002
EventMagnoelectronics and Magnetic Materials - Novel Phenomena and Advanced Characterization - Boston, MA, United States
Duration: 1 Dec 20025 Dec 2002

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