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Spin fluctuations in the antiferromagnetic heavy-fermion system U2Zn17


Inelastic neutron scattering from the antiferromagnetic (TN=9.7 K) heavy-fermion system U2Zn17 reveals magnetic fluctuations which are highly localized in reciprocal space and broad in frequency. At higher energies, the fluctuations persist almost unchanged to temperatures well above Tn. Analysis of the neutron and bulk susceptibility data in terms of Kondo-type single-ion response functions modified by Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions between ions indicates that it is the temperature dependence anticipated theoretically of the effective RKKY coupling which drives the magnetic phase transition in U2Zn17. © 1987 The American Physical Society.

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