Rare Kondo phenomenon found in transition metal oxide, furthering decade-long debate

As temperature decreases, so does the electrical resistance of metals—most of the time. In metal with magnetic impurities, electrical resistance can increase as the temperature drops due to a strange phenomenon called the Kondo effect. Caused by quantum interactions between the magnetic impurities and conduction electrons in the metal, the Kondo effect has appeared largely limited to compounds consisting of rare earth elements.