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- W1564956963 abstract "Multiterminal measurements have typically been employed to examine electronic properties of strongly correlated electronic materials such as transition metal oxides without the influence of contact effects. In contrast, in this work we investigate the interface properties of Fe$_3$O$_4$ with different metals, with the contact effects providing a window on the physics at work in the correlated oxide. Contact resistances are determined by means of four-terminal electrical measurements as a function of source voltage and temperature. Contact resistances vary systematically with the work function of the electrode metal, $phi(M)$, $M=$Cu, Au and Pt, with higher work function yielding lower contact resistance. This trend and the observation that contact resistances are directly proportional to the Fe$_3$O$_4$ resistivity are consistent with modeling the oxide as an effective $p$-type semiconductor with hopping transport. The jumps in contact resistance values at the bias-driven insulator-metal transition have a similar trend with $phi$($M$), consistent with the transition mechanism of charge gap closure by electric field." @default.
- W1564956963 created "2016-06-24" @default.
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- W1564956963 date "2010-11-29" @default.
- W1564956963 modified "2023-09-27" @default.
- W1564956963 title "Contact effects on transport in magnetite, an archetypal correlated transition metal oxide" @default.
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