Effect of Pd substitution for Ni on magnetism in UNiAl

Itinerant 5f-electron antiferromagnet UNiAI(T-N = 19.3 K) undergoes a metam agnetic transition in fields (B-c approximate to 11 T) applied along the c- axis of the hexagonal ZrNiAl-type structure. The same structure is preserve d in the UN1-xPdxAl solid solutions x less than or equal to 0.4 characteriz ed by isotropic lattice expansion with increasing x. The gradual increase o f B-c and T-N due to the Pd doping can be tentatively attributed to enhance ment of antiferromagnetic exchange interactions. (C) 1999 Elsevier Science B.V. All rights reserved.