Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

11-1-2010

Journal or Book Title

Physical Review B

Volume

82

Issue

18

First Page

184407

DOI

10.1103/PhysRevB.82.184407

Abstract

The dynamic susceptibility χ′′(ΔE), measured by inelastic neutron-scattering measurements, shows a broad peak centered at Emax=15 meV for the cubic actinide compound URu2Zn20 and 7 meV at zone center and at the (1/2, 1/2, 1/2) zone boundary for the rare-earth counterpart compound YbFe2Zn20. For URu2Zn20, the low-temperature susceptibility and magnetic specific-heat coefficient γ=Cmag/T take the values χ=0.011 emu/mole and γ=190 mJ/mole K2 at T=2 K. These values are roughly three times smaller, and Emax is three times larger, than recently reported for the related compound UCo2Zn20, so that χ and γ scale inversely with the characteristic energy for spin fluctuations, Tsf=Emax/kB. While χ(T), Cmag(T), and Emax of the 4f compound YbFe2Zn20 are very well described by the Kondo impurity model, we show that the model works poorly for URu2Zn20 and UCo2Zn20, suggesting that the scaling behavior of the actinide compounds arises from spin fluctuations of itinerant 5f electrons.

Comments

This article is published as Wang, C. H., Andrew D. Christianson, J. M. Lawrence, E. D. Bauer, E. A. Goremychkin, A. I. Kolesnikov, Frans Trouw, F. Ronning, J. D. Thompson, M. D. Lumsden, N. Ni, E. D. Mun, S. Jia, P. C. Canfield, Y. Qiu, and J. R. D. Copley . "Neutron scattering and scaling behavior in URu 2 Zn 20 and YbFe 2 Zn 20." Physical Review B 82, no. 18 (2010): 184407. DOI: 10.1103/PhysRevB.82.184407.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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