RUS  ENG
Full version
JOURNALS // Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki // Archive

Pis'ma v Zh. Èksper. Teoret. Fiz., 2005 Volume 82, Issue 3, Pages 154–160 (Mi jetpl1524)

This article is cited in 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 Pu0.95Ga0.05 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 μeff, 5ƒ (g e = 2) = 0.15(5)μB 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 χƒƒ at temperatures below 50 K are discussed.

PACS: 71.27.1a, 75.30.Cr, 75.40.Gb, 76.60.2k

Received: 27.06.2005


 English version:
Journal of Experimental and Theoretical Physics Letters, 2005, 82:3, 139–144

Bibliographic databases:


© Steklov Math. Inst. of RAS, 2024