Journal
PHYSICAL REVIEW B
Volume 79, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.245131
Keywords
electrical conductivity transitions; electrical resistivity; epitaxial layers; hysteresis; insulating thin films; iron compounds; metal-insulator transition
Funding
- U.S. Department of Energy [DE-FG02-06ER46337]
- Science Foundation of Ireland [06/IN.1/I91]
- U.S. Department of Energy (DOE) [DE-FG02-06ER46337] Funding Source: U.S. Department of Energy (DOE)
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In many transition-metal oxides the electrical resistance is observed to undergo dramatic changes induced by large biases. In magnetite, Fe3O4, below the Verwey temperature, an electric-field-driven transition to a state of lower resistance was recently found, with hysteretic current-voltage response. We report the results of pulsed electrical conduction measurements in epitaxial magnetite thin films. We show that while the high- to low-resistance transition is driven by electric field, the hysteresis observed in I-V curves results from Joule heating in the low-resistance state. The shape of the hysteresis loop depends on pulse parameters and reduces to a hysteresis-free jump of the current provided thermal relaxation is rapid compared to the time between voltage pulses. A simple relaxation-time thermal model is proposed that captures the essentials of the hysteresis mechanism.
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