Current-Induced Insulator-Metal Transition and Pattern Formation in an Organic Charge-Transfer Complex

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Science  04 Jun 1999:
Vol. 284, Issue 5420, pp. 1645-1647
DOI: 10.1126/science.284.5420.1645

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Organic molecular Mott insulators, in which carriers are localized as a result of the electron correlation, showed nonlinear electric conduction upon application of a high electric field along the molecular stacking axis. The current-driven low-resistive state of potassium 7,7,8,8-tetracyanoquinodimethanane was stabilized down to 2 kelvin, where a metallic path was visible with a microscope. The current flow caused a stripe-like periodic phase-segregation into the carrier-rich and carrier-poor regions along the current path.

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