Antiferro-multipolar short range order above the antiferro-quadrupolar ordering temperature in CeB6

We have studied the short range order above the long range ordering tempera ture in CeB6 and NdB6 by the measurements of the specific heat and magnetiz ation. The results indicate that both compounds exhibit a large short range order but its nature is quite different, i.e. the antiferro (AF) magnetic fluctuation above the Neel temperature in NdB6 as is Often observed in many of the AF magnets hut the unexpected ferromagnetic one is observed above t he antiferro-quadrupolar (AFQ) ordering temperature, T-Q in CeB6. The latte r is explained hg the coexistence of the AFQ and T-xyz AF octupolar short r ange order above T-Q.