GROUND-STATE PROPERTIES OF YBBIPT

The physical properties of YbBiPt are complicated because there are th ree competing energy scales all of order 1 K: the coupling energy betw een Yb moments as measured by the Neel temperature (T(N)), the splitti ng between the groundstate and first excited crystal electric field le vels (T(DELTACEF)) and the Kondo temperature (T(K)). The magnetically ordered phase below T(N) = 0.45 K appears to be reduced local moment o rdering that is incommensurate with the lattice. Associated with this order is the formation of a superzone gap that can be detected by elec trical resistivity measurements. Attempts to treat T(K) and T(DELTACEF ) separately only account for gross features of the data presented.