ANTIFERROMAGNETIC PHASE-TRANSITION IN GDAG

The antiferromagnetic phase transition in a GdAg single crystal has be en investigated by neutron diffraction. GdAg undergoes a second-order phase transition at T-N=132.8(1) K to an antiferromagnetic phase with propagation vector k=(1/2, 1/2, 0). The magnetic moments are parallel to the cubic nuclear cell edge for which the magnetic cell is not doub led. The magnetic moment per Gd is determined to be 7.6 +/- 0.3 mu(B). The sublattice magnetization follows approximately the Brillouin func tion B-7/2. Copyright (C) 1996 Elsevier Science Ltd