Hyperfine Interactions and Relaxation Effects in Laves-Phase Intermetallic Compounds of Neptunium
Journal Article
·
· Physical Review, B: Solid State
Magnetic properties of cubic Laves-phase compounds of Np were studied using the Moessbauer effect of the 59.5-keV transition in /sup 237/Np. The compounds studied were NpAl/sub 2/, NpCo/sub 2/, NpNi/sub 2/, N pFe/sub 2/, and NpIr/sub 2/. Hyperfine-interaction parameters and ordering temperatures were deduced from these measurements. If the values cf H(T)/H(O) are piotted as a function of T/T/sub c/, the points (except those of NpFe/sub 2/) lie on the molecular-field-theory curve for S = 1/2. Quadrupole interactions were found to be very small. This behavior is consistent with the assumption that the ground crystalline state in these compounds is an isolated Kramers doublet. Relaxation phenomena were observed in the spectra. The spectra could be fitted by assuming relaxation effects within the Kramers doublet with a relaxation time of approximates 4 x 10/sup -11/ s. Isomer shifts were measured and found to change regularly with the size of the unit cell.
- Research Organization:
- Nuclear Research Center-Negev, Beer Sheva, Israel
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-29-018972
- OSTI ID:
- 4363459
- Journal Information:
- Physical Review, B: Solid State, Journal Name: Physical Review, B: Solid State Journal Issue: 5 Vol. 8; ISSN 0556-2805; ISSN PRBMDO
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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· Inorg. Chem.; (United States)
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