STUDIES OF THE MAGNETIZATION DENSITIES IN PU COMPOUNDS. DETERMINATION OF THE DEGREE OF LOCALIZATION
The electronic configuration of trivalent Pu is nominally a 58Zf5 state in which there is a strong cancellation of the L (orbital) and S (spin) components in the J=5/2 ground state. This leads to small g factors and magnetic moments, and to unusual neutron magnetic form factors f(Q) with maxima at Q values greater than zero. We present here the results of form-factor measurements (taken on the polarized-neutron diffractometer at the ILL) on single crystals of PuSb, PuTe, and PuFe-2. These results show that the form factor, which is a measure of the magnetization density of the 58Zf electrons around the Pu nucleus, is sensitive to the degree of localization of the 58Zf electrons. For example, in PuSb the 58Zf electrons are well localized and the form factor is in good agreement with the predictions of intermediate coupling and crystal-field theory. In PuTe f(Q) falls monotonically from a maximum at Q=0, indicating an almost spin-only system. This is produced by wide 58Zf bands, which give rise to the observed T-independent magnetic susceptibility. In PuFe-2, however, a large maximum occurs in f(Q). We believe this arises from strong hybridization of the 58Zf and 38Zd Fe electrons, which leads to a reduction in the Pu orbital component.
Bibliographic Reference: 32ND CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, CHICAGO, ILLINOIS (USA), NOV. 9-12, 1987 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 33503 ORA
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Record Number: 1989126030401 / Last updated on: 1989-01-01
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