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Exploring negative resistance: the lambda diode

Exploring negative resistance: the lambda diode
Resistance is omnipresent in electronics. A few materials (super conductors) lose their resistance at fairly low temperatures, and all materials lose it completely at absolute zero. However; at normal temperatures. most (conducting) materials obey Ohm's law, but some show characteristics of negative resistance. Are these breaking Ohm's law? And what good is negative resistance?
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