| Autor: |
Murani, A. P., Taylor, A. D., Osborn, R., Bowden, Z. A. |
| Zdroj: |
Philosophical Magazine B; June 1992, Vol. 65 Issue: 6 p1333-1342, 10p |
| Abstrakt: |
Measurements of the paramagnetic spectral response of YbAl2, reveal a broad Lorentzian inelastic hump closely similar to that of α-Ce in spectral shape, in integrated intensity (within ± 20% uncertainty), as well as in characteristic energy ωo (=180 ± 10meV). Relating the latter to the linear specific heat coefficient y via a Fermi-liquid relation requires that the 4f occupancy (nf) be close to unity (i.e. 0.9 ± 0.1). With the same values of (nf) and ωo the Fermi-liquid relation for the low-temperature bulk susceptibility χ(0) yields a reduced effective moment of magnitude close to that for the crystal-field Γ7, state (N = 2) or the J = 5/2; spin-orbit state (N = 6), the latter implying an inversion of Hund's rule states of Yb. The nearly integral valence of Yb in YbAl2, suggested by the Fermi-liquid analysis is in conflict with the lattice constant, photoemission and L111 X-ray absorption data which all yield (nf)≈ 0·4. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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