Ytterbium dirhodium disilicide (YbRh2Si2), also abbreviated YRS, is a heavy fermion solid state compound of ytterbium, rhodium and silicon. It becomes superconducting when cooled to 2 mK. Just above this temperature the heat capacity is extremely high, and the electrons behave as if they were 1,000,000 times heavier than they really are.[1]
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edit- ^ "Heavy fermions get nuclear boost on way to superconductivity". Phys.org. 28 January 2016. Retrieved 29 January 2016.