MAGNETIC-COMPTON-SCATTERING STUDY OF SPIN MOMENTS IN UFE2

Spin moments were derived from the magnetic-Compton profile of UFe2 wh ich was measured using 59.38 keV circularly polarized synchrotron radi ation from the Accumulation Ring Source at KEK, Japan. Although the ne t moment on the uranium site is no more than a tenth of a Bohr magneto n, the individual spin and orbital moments, which are coupled antipara llel, are much larger and it is the spin moment that can be determined in magnetic-Compton scattering. The data have been analyzed in terms of the U 5f, Fe 3d and delocalized spin moments. The observed uranium- 5f spin moment is less than half(i.e., <0.25 mu(B)) and the diffuse sp in moment more than double (i.e., >0.20 mu(B)) those predicted from th eory. These values compare favorably with those deduced from neutron m easurements of the total magnetization.