Clarence Zener introduced double exchange to connect electrical conduction with ferromagnetism in mixed-valence manganese compounds. In this mechanism, carrier motion and the alignment of local spins influence one another: the magnetic arrangement changes how effectively an electron can move, and the resulting change in electronic energy can favor aligned spins. His 1951 treatment of manganese compounds with a perovskite crystal structure sought to explain why conduction and ferromagnetic ordering occur together. It links magnetic order to carrier motion rather than treating conductivity and magnetism as unrelated properties.[ref]
His work on double exchange connected carrier motion with ferromagnetism in mixed-valence materials. Carnegie Mellon preserves his research papers: findingaids.library.cmu.edu/repositories/2/resources/93.
Clarence Melvin Zener, from Carnegie Mellon University Archives
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Clarence Zener is a notable figure primarily known for his contributions to electrical engineering, particularly in the field of semiconductor devices. He is best known for developing the Zener diode, a type of semiconductor device that allows current to flow in the reverse direction when a specific voltage, known as the Zener breakdown voltage, is reached. Zener diodes are widely used in various applications, including voltage regulation and protection circuits.