Interplay of bulk and interface effects in the electric-field-driven transition in magnetite
Citation:
A. A. Fursina, R. G. S. Sofin, I. V. Shvets, D. Natelson, Interplay of bulk and interface effects in the electric-field-driven transition in magnetite, Physical Review B, 81, 4, 2010, 045123-Download Item:
Interplay.pdf (Published (publisher's copy) - Peer Reviewed) 614.2Kb
Abstract:
Contact effects in devices incorporating strongly correlated electronic materials are comparatively unexplored.
We have investigated the electrically driven phase transition in magnetite 100 thin films by fourterminal
methods. In the lateral configuration, the channel length is less than 2 m, and voltage-probe wires
100 nm in width are directly patterned within the channel. Multilead measurements quantitatively separate
the contributions of each electrode interface and the magnetite channel.We demonstrate that on the onset of the
transition contact resistances at both source and drain electrodes and the resistance of magnetite channel
decrease abruptly. Temperature-dependent electrical measurements below the Verwey temperature indicate
thermally activated transport over the charge gap. The behavior of the magnetite system at a transition point is
consistent with a theoretically predicted transition mechanism of charge gap closure by electric field.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
Author's Homepage:
http://people.tcd.ie/ivchvetsDescription:
PUBLISHED
Author: SHVETS, IGOR
Type of material:
Journal ArticleCollections:
Series/Report no:
Physical Review B81
4
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Full text availableSubject (TCD):
Nanoscience & MaterialsDOI:
http://dx.doi.org/10.1103/PhysRevB.81.045123Licences: