Magnetization density in heavy-fermion UPd2Al3

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Abstract
The induced magnetization density has been measured at T = 36 K (above the antiferromagnetic ordering temperature of 14 K) in a single crystal of the heavy-fermion material UPd2Al3. A magnetic field of 5 T was applied along the easy axis of magnetization. The magnetization density 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 measured by magnetization measurements on the same crystal. This indicates the presence of a significant positive (with respect to the uranium moment) conduction electron polarization. The ratio of the orbital to the spin moment of uranium found experimentally is -2.01(25), compared with the free-ion values of -2.56 (for U3+) and -3.29 (for U4+), and a recent theoretical prediction of-1.35.