MAGNETIZATION DENSITY IN HEAVY-FERMION UPD2AL3

The induced magnetization density has been measured at T = 36 K (above the antiferromagnetic ordering temperature of 14 K) in a single cryst al of the heavy-fermion material UPd2Al3. A magnetic field of 5 T was applied along the easy axis of magnetization. The magnetization densit y as measured by the polarized-neutron technique is associated totally with the uranium atom; no spin transfer is found on the Pd atoms. The induced moment, as measured by neutrons, is some 12% below that measu red by magnetization measurements on the same crystal. This indicates the presence of a significant positive (with respect to the uranium mo ment) conduction electron Polarization. The,ratio of the orbital to th e spin moment of uranium found experimentally is -2.01(25), compared w ith the free-ion values of -2.56 (for U3+) and -3.29(for U4+), and a r ecent theoretical prediction of -1.35.