Schematic of Negative Thermal Expansion in Samarium Sulfide (IMAGE)

DOE/Brookhaven National Laboratory

Schematic of Negative Thermal Expansion in Samarium Sulfide

Caption

Each samarium atom in a sample of golden samarium sulfide (inset photo) has a tiny magnetic moment (blue arrows). When cooled, a phenomenon called the Kondo effect causes some of the free electrons in the metal (yellow arrows) to move into the samarium atoms' outermost electron shell to screen these

Credit

Brookhaven National Laboratory

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