Susceptibility and Intra-Atomic Exchange in Nickel
1968; American Physical Society; Volume: 20; Issue: 17 Linguagem: Inglês
10.1103/physrevlett.20.933
ISSN1092-0145
AutoresG. Allan, W.M. Lomer, R. D. Lowde, C. G. Windsor,
Tópico(s)Rare-earth and actinide compounds
ResumoWe have calculated the generalized susceptibility $\ensuremath{\chi}(\stackrel{\ensuremath{\rightarrow}}{\mathrm{K}}, \ensuremath{\omega})$ of paramagnetic nickel at $1.6{T}_{c}$ using a simple five---$3d$-band model in tight-binding approximation and compared it with neutron-scattering measurements. The only adjustable parameter was the exchange enhancement, considered to arise from an effective Coulomb interaction ${I}_{\mathrm{eff}}(\stackrel{\ensuremath{\rightarrow}}{\mathrm{r}})$ in the random-phase approximation. Our analysis is consistent with the interaction being dominated by the on-site term at $\mathcal{r}=0$, the relative contribution from any one nearest-neighbor position coming to less than 10%.
Referência(s)