MAGNETIC HYPERFINE FIELDS ON CD-111 IN THE PD1+XMNSB HEUSLER ALLOYS

The experiments were performed by the time-differential perturbed angular correlation technique in the range 0 less than equivalent to x less than equivalent to 1. Results show that the probe radioactive atom of **1**1**1In (which decays to **1**1**1Cd by electron capture), incorporated in small quantity (carrier-free) into the alloy, can occupy any of the three sites in Pd//1// plus //xMnSb. The measurement of the mhf on the same probe at various distances from the magnetic atom of Mn in the Pd//1// plus //xMnSb alloy is very important and can supply essential information to a better understanding of the mechanism which leads to the magnetic order. The results are discussed in terms of the various models that try to explain the origin of the mhf acting on diamagnetic impurities in ferromagnets and especially in Heusler alloys.