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Definition |  Kondo effect

Definition | Kondo effect

Japanese physicist Jun Kondo, after whom the Kondo effect is named. © AIST, Tokyo

The Kondo effect, named after physicistphysicist The Japanese Jun Kondo who gave a good theoretical description in 1964, bringsbrings on a property of materials discovered in the 1930s concerning the variation of theirs resistenceresistence with the temperature. Most metalsmetals they see their resistance decrease when cooled but some alloys with magnetic impurities show a resistance that increases again below a certain low enough temperature.

Principle of the Kondo effect

The Kondo effect comes from the laws of quantum mechanics, just like the Kondo effect superconductivitysuperconductivity. It can be described with the so-called Kondo lattice, i.e. a periodic distribution ofatomsatoms magnetic particles that constitute impurities in a metallic conductor. This network is such that it looks like a magnetic coupling between the spins of some electronselectrons on the orbitalsorbitals fixed magnetic atoms and the spin of the conduction electrons of the material under examination.

It therefore occurs as a kind of quantum entanglement of electrons, but it would be more accurate to talk about ithybridizationhybridization.



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