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12 papers
CONDENSED MATTER
Features of the magnetic state of ƒ electrons in the stabilized δ phase of the Pu0.95Ga0.05 alloy
S. V. Verkhovskiia,
V. E. Arkhipova,
Yu. N. Zuevb,
Yu. V. Piskunova,
K. N. Mikhaleva,
A. V. Koroleva,
I. L. Svyatovb,
A. V. Pogudina,
V. V. Ogloblicheva,
A. L. Buzlukova a Institute of Metal Physics, Ural Division of the Russian Academy of Sciences
b Russian Federal Nuclear Center All-Russian Scientific Research Institute of Technical Physics
Abstract:
For the Pu
0.95Ga
0.05 alloy belonging to the stabilized δ phase of the Pu-Ga system, the
69Ga NMR spectra are measured in the temperature interval 10–650 K and the static magnetic susceptibility χ is measured in the interval
T = 20–350 K. In the region
T >
T* = 235 K, the temperature-dependent magnetic part of the shift
K(
T) of the Ga NMR line reproduces the χ(
T) dependence and follows the Curie-Weiss law
K(
T) ∼ (
T + Θ)
−1 with Θ = 280(40) K, which is typical of incoherent spin fluctuations of localized
ƒ electrons in concentrated nonmagnetic Kondo systems. The estimate of the effective magnetic moment μ
eff, 5ƒ (
g e = 2) = 0.15(5)μ
B per Pu atom testifies to a strong suppression of the spin magnetism in the alloy, where the configuration of the
ƒ shell of a Pu ion is close to atomic-like
ƒ 6. The difference between the
K(
T) and χ(
T) dependences observed for the alloy in the temperature range
T <
T* is analyzed in terms of the two-fluid description of Kondo lattices developed by Pines
et al. [15, 16] in application to the coherent state of a heavy-fermion liquid. Possible causes for the anomalous increase in long-wave contributions in the spatial dispersion of the localized spin susceptibility component of
ƒ electrons χ
ƒƒ at temperatures below 50 K are discussed.
PACS:
71.27.1a,
75.30.Cr,
75.40.Gb, 76.60.2k
Received: 27.06.2005