Rare Earth impurities in yb(6) and zrb(12).

We present data on the depression of the superconducting transition temperatures of YB(6) and ZrB(12) by rare earth impurities. These data show unusual features. Ce in YB(6) is in some ways analogous to Yb in ZrB(12), and this analogy also appears to hold between Ce in CeB(6) and YB in YbB(12).

Magnetic susceptibility of Ce and Pr in SrB6 and YB6

Magnetic susceptibility data suggest that the crystal field splittings of the 4f levels of Ce and Pr impurities are larger in metallic YB6 than in isostructural and semiconducting SrB6, contrary to what might be expected. © 1969.