Title :
Magnetic ordering in (U0.5Tb0.5)Co2Ge2, studied by AC-susceptibility and neutron-diffraction measurements
Author :
Kuznietz, Moshe ; Pinto, Haim ; Ettedgui, Hanania ; Melamud, Mordechai
Author_Institution :
Nuclear Res. Center-Negev, Beer-Sheva, Israel
fDate :
11/1/1994 12:00:00 AM
Abstract :
UCo2Ge2, TbCo2Ge2 and their intermediate solid solution, (U0.5Tb0.5)Co 2Ge2, crystallize in the ThCr2Si2 -type structure. AC-susceptibility of the latter at 20-295 K yields paramagnetic values μeff=7.3±0.5 μB and θ=-50±15 K. The magnetic structure observed by powder neutron diffraction at ≈10 K is AF-I (+-+-) [with wavevector k=(0,0,1)], characterized by (U,Tb) planes stacked antiferromagnetically with ordered moments along the tetragonal axis. The calculated average ordered magnetic moment per (U,Tb) atom, 4.05±0.03 μB , is compared with those of Tb in TbCo2Ge2 in UCo2Ge2, leading to a proposal of ferrimagnetic (U,Tb) planes with antiferromagnetic coupling of U and Tb moments
Keywords :
cobalt compounds; ferrimagnetic materials; ferromagnetic materials; magnetic moments; magnetic structure; magnetic susceptibility; neutron diffraction; paramagnetic materials; terbium compounds; uranium compounds; (U0.5Tb0.5)Co2Ge2; 20 to 295 K; 50 K; 80 K; AC-susceptibility; antiferromagnetic coupling; antiferromagnetic stacking; average ordered magnetic moment; ferrimagnetic planes; magnetic ordering; magnetic structure; neutron-diffraction; paramagnetic values; powder neutron diffraction; tetragonal axis; Antiferromagnetic materials; Couplings; Crystallization; Diffraction; Ferrimagnetic materials; Magnetic moments; Neutrons; Paramagnetic materials; Powders; Proposals;
Journal_Title :
Magnetics, IEEE Transactions on
