TY - JOUR
T1 - Observation of the Verwey transition in Fe3O4 nanocrystals
AU - Markovich, Gil
AU - Fried, Tcipi
AU - Poddar, Pankaj
AU - Sharoni, Amos
AU - Katz, David
AU - Wizansky, Tommer
AU - Millo, Oded
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0038746616&partnerID=8YFLogxK
U2 - 10.1557/proc-746-q4.1
DO - 10.1557/proc-746-q4.1
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AN - SCOPUS:0038746616
SN - 0272-9172
VL - 746
SP - 151
EP - 156
JO - Materials Research Society Symposium - Proceedings
JF - Materials Research Society Symposium - Proceedings
T2 - Magnoelectronics and Magnetic Materials - Novel Phenomena and Advanced Characterization
Y2 - 1 December 2002 through 5 December 2002
ER -