Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-12-29
Phys. Rev. B 81, 045123 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 5 figures, to appear in PRB
Scientific paper
10.1103/PhysRevB.81.045123
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 four-terminal methods. In the lateral configuration, the channel length is less than 2 $\mu$m, and voltage-probe wires $\sim$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.
Fursina Alexandra
Natelson Douglas
Shvets Igor V.
Sofin R. G. S.
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