“…The discovery of superconductivity in the heavy fermion compound PrOs 4 Sb 12 1,2 has spawned a flurry of experimental 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19 and theoretical 9,20,21,22,23,24,25 activity. PrOs 4 Sb 12 is the first Prbased heavy fermion superconductor and the first among the family of rare-earth filled skutterudite compounds.…”