Local metallic conductivity of thin polyimide films as a result of “soft” electrical breakdown

The electrical breakdown of a thin polyimide film between metal electrodes has been investigated under conditions of strong confinement of the breakdown current. The result of this “soft” electrical breakdown is a local, highly conducting channel in the insulating film implanted in the polymer and consisting of a compound of carbon and metal from the electrodes. It is shown that the polymer channel is converted to the superconducting state by the superconducting properties of the metal from the electrodes.

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