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Physicists have created the first 2D "heavy-fermion" material.

Heavy-fermion materials such as cerium indide (CeIn3) are so called because their conduction electrons, which are fermions, move as if they are hundreds of times more massive than electrons in conventional metals such as copper. This large "effective mass" arises because the interactions between the electrons are very strong. Similar strong interactions are thought to play an important role in high-temperature superconductors – a class of materials that physicists have struggled to understand for nearly 25 years.


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