期刊
PHYSICAL REVIEW B
卷 73, 期 9, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.73.094453
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We present mu SR measurements on Pu metal which set stringent upper limits on the magnitude of the ordered moments mu(ord) in alpha-Pu and delta-stabilized Pu (alloyed with 4.3 at.% Ga). The magnitude of the low-temperature (4 K < T < 100-150 K) mu SR rate in zero applied field is independent of temperature and consistent with nuclear dipolar broadening alone. The Knight shift in alpha-Pu in 2 T applied field is also independent of temperature below about 100 K, but increases abruptly at higher temperatures, an effect likely caused by muon diffusion to paramagnetic impurities. A rough estimate for the muon hopping rate 1/tau(h) at 150 K in alpha-Pu yields 1/tau(h)approximate to 3x10(7) s(-1); no estimate is yet obtained for delta-Pu. The principal results reported here are limits for mu(ord) in both alpha- and delta-Pu <= 10(-3)mu(B) at T congruent to 4 K. These limits are discussed in terms of recent models of the electronic properties of delta-Pu, where magnetism has been previously predicted. Our results are consistent with, but cannot unambiguously distinguish between, cases where the moments in delta-Pu are essentially zero, possess very weak interatomic exchange, are reduced by hybridization, or are washed out by dynamical fluctuations.
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