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The ultimately strong electron-electron interaction in metal is realized in the so-called heavy-fermion compound containing rare earth elements, in which the electron effective mass is enhanced by a few hundred times the free electron mass.

Rare earth metals--a group of 17 chemical elements found in solar panels, wind turbines, electric car motors, lithium-ion batteries, and more--are critical to a future reliant on clean energy. The problem is that China has the majority of the supply , and it has used that leverage to slow exports and raise prices

Vast deposits of rare earth elements and critical minerals found in Afghanistan by U.S. [More]