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    STUDIA PHYSICA - Issue no. 1 / 2003  
         
  Article:   THE SPIN FLUCTUATIONS IN THE UNI5-ZALZ SYSTEMS.

Authors:  ILEANA LUPSA, P. LUCACI. 		 
       
         
  Abstract:  The magnetic properties of U1-XDyXNi5 and U1-xDyxAlNi4 systems were investigated in the 4-600 K temperature range and fields up to 9 T. The UNi5 and UAlNi4 compounds show an enhanced susceptibility below 140 K and a Pauli paramagnet behaviour in the high temperature region. The compounds DyNi5 and DyNi4Al are magnetically ordered below the transition temperatures 11.5 K and 8 K respectively. A Ni magnetic moment is detected for DyNi5 and a small one for DyNi4Al. In the high temperature region an effective magnetic moment per nickel atom is evidenced. Replacing uranium by dysprosium these eff/Ni atom values are decreasing. The paramagnetic Curie temperatures for are negative and are decreasing as uranium content is increased. The magnetic behaviour of Ni atoms was discussed in the spin fluctuations model.  
         
     
         
         
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