Determination of the energy level parameters and crystal field splitting for Fe in Cu
Conference
·
· AIP (Am. Inst. Phys.) Conf. Proc.; (United States)
OSTI ID:7345680
- Xerox Palo Alto Research Center, CA
Values for the Friedel-Anderson energy level parameters for Fe in Cu have been obtained using the measured conduction electron spin density around the Fe impurity. The expression for the spin density due to Jena and Geldart was applied to the NMR data on the spectral shifts of the Cu near neighbor resonances. A good explanation for this data could not be obtained unless the crystal field splitting of the Fe d-levels was taken into account. Direct experimental evidence for such a non-negligible crystal field splitting has been obtained in the single crystal NMR studies of T. Stakelon. The energy level paramters we obtain are: t - e crystal field splitting, ..delta.. = 0.5eV; virtual level width, GAMMA/sub d/ = 0.7 eV; Coulomb splitting of spin-up and spin-down virtual levels, U = 5.6 eV. These results are consistent with CuFe being magnetic in the Anderson sense (U/GAMMA/sub d/ = 8 greater than 1) and yield, via the Friedel sum rule, a total of seven d-electrons with a net spin of 1.25.
- OSTI ID:
- 7345680
- Conference Information:
- Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Journal Volume: 29
- Country of Publication:
- United States
- Language:
- English
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