| Autor: |
I. L. Svyatov, Yu.N. Zouev, Yu. V. Piskunov, V. V. Ogloblichev, A. Gerashenko, A.L. Buzlukov, V. E. Arkhipov, K. N. Mikhalev, S. V. Verkhovskii, A. V. Korolev |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Journal of Nuclear Materials. 385:25-27 |
| ISSN: |
0022-3115 |
| DOI: |
10.1016/j.jnucmat.2008.09.047 |
| Popis: |
69Ga nuclear magnetic resonance spectra, line shifts (69K) and nuclear spin-lattice relaxation rate 69 T 1 - 1 have been measured in the 20 years aged Pu0.95Ga0.05 and in fresh prepared Pu0.92Ga0.08 alloys, stabilized δ-phase, at magnetic field of 9.4 T in the temperature range (10–500) K. The line shift and 69 T 1 - 1 are determined correspondingly by the static and fluctuating-in-time parts of the local magnetic field that originates in transferred hyperfine coupling the Ga nuclear spin with the nearest f-electron environment of more magnetic Pu. Temperature behavior of the resonance properties is found the same in fresh Pu0.92Ga0.08 and aged Pu0.95Ga0.05 alloy. The NMR results are in favor that δ-phase of Pu1−xGax alloys represents at T > 200 K the Kondo lattice, in which the localized electronic spins fluctuate independently from each other without any macroscopic coherence. The coherent state like in heavy-fermion liquids emerges in Pu0.95Ga0.05 below T∗ = 200 K. A little bit higher estimate of crossover temperature T∗ = 250 K was founded for Pu0.92Ga0.08. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect