Abstract
Inelastic neutron scattering from the antiferromagnetic (${\mathrm{T}}_{\mathrm{N}}$=9.7 K) heavy-fermion system ${\mathrm{U}}_{2}$${\mathrm{Zn}}_{17}$ reveals magnetic fluctuations which are highly localized in reciprocal space and broad in frequency. At higher energies, the fluctuations persist almost unchanged to temperatures well above ${\mathrm{T}}_{\mathrm{n}}$. Analysis of the neutron and bulk susceptibility data in terms of Kondo-type single-ion response functions modified by Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions between ions indicates that it is the temperature dependence---anticipated theoretically---of the effective RKKY coupling which drives the magnetic phase transition in ${\mathrm{U}}_{2}$${\mathrm{Zn}}_{17}$.
Highlights
Inelastic neutron scattering from the antiferromagnetic (TN =9.7 K) heavy-fermion system U2zn/7 reveals magnetic fluctuations which are highly localized in reciprocal space and broad in frequency
H cu scans) at attempts to fit the data in Fig. 1 by the resolutioncorrected S(Q, ru) appropriate for undamped spin waves met with failure
2 MARCH 1987 below TN can be described in terms of a surprisingly simple model, where U moments with individual Kondoimpurity- type dynamics are coupled to their nearest neighbors via an effective RKKY interaction, Jo
Summary
Inelastic neutron scattering from the antiferromagnetic (TN =9.7 K) heavy-fermion system U2zn/7 reveals magnetic fluctuations which are highly localized in reciprocal space and broad in frequency. — — by Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions between ions indicates that it is the temperature dependence anticipated theoretically of the eflective RKKY coupling which drives the magnetic phase transition in U2znl 7. To observe the magnetic excitations which give rise to the anomalous properties of U2Zn~7, we have performed an inelastic-neutron-scattering study.
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