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arXiv 1003.3484cond-mat.str-el
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URu2Zn20和YbFe2Zn20中的中子散射和标度行为

Neutron scattering and scaling behavior in URu2Zn20 and YbFe2Zn20

C. H. Wang, A. D. Christianson, J. M. Lawrence, E. D. Bauer, E. A. Goremychkin, A. I. Kolesnikov, F. Trouw, F. Ronning, J. D. Thompson, M. D. Lumsden, N. Ni, E.… 展开作者

C. H. Wang, A. D. Christianson, J. M. Lawrence, E. D. Bauer, E. A. Goremychkin, A. I. Kolesnikov, F. Trouw, F. Ronning, J. D. Thompson, M. D. Lumsden, N. Ni, E. D. Mun, S. Jia, P. C. Canfield, Y. Qiu, J. R. D. Copley

摘要:

用非弹性中子散射测量法测得的动态磁化率χ”(Δ E)表明,立方锕系化合物URu_2 Zn_(20)在Emax = 16.5meV处有一宽峰,稀土对应化合物YbFe_2 Zn_(20)在(1/2,1/2,1/2)带界处有一宽峰,Emax = 7 meV。对于URu 2 Zn 20,低温磁化率和磁比热系数γ = Cmag/T在T = 2 K时取值chi = 0.011 emu/mole和γ = 190 mJ/mole-K2。这些值比最近报道的相关化合物UCo 2 Zn 20的值大约小三倍,Emax大三倍,因此chi和gamma与自旋涨落的特征能量Tsf = Emax/kB成反比。虽然chi(T),Cmag(T),和Emax的4f化合物YbFe 2 Zn 20是非常好的描述的Kondo杂质模型,我们表明,该模型的效果不佳的URu 2 Zn 20和UCo 2 Zn 20,这表明锕系化合物的标度行为产生的巡游5 f电子的自旋波动。

英文摘要:

The dynamic susceptibility chi"(deltaE), measured by inelastic neutron scattering measurements, shows a broad peak centered at Emax = 16.5 meV for the cubic actinide compound URu2Zn20 and 7 meV 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 gamma = Cmag/T take the values chi = 0.011 emu/mole and gamma = 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 chi and gamma scale inversely with the characteristic energy for spin fluctuations, Tsf = Emax/kB. While chi(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.

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