Itinerant magnetism in the Kondo crystalCeB6as indicated by polarized neutron scattering

A magnetic Bragg reflection corresponding to the wave vector ${\mathbf{k}}_{13}=(2\ensuremath{\pi}∕a)[\frac{1}{2},\frac{1}{2},\frac{1}{2}]$ of the antiferro-quadrupolar ordering in $\mathrm{Ce}{\mathrm{B}}_{6}$ is found without external magnetic field below the N\'eel temperature ${T}_{N}\ensuremath{\approx}2.4\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Its intensity is two orders of magnitude weaker than those due to the basic magnetic structure. The peak has a width of the other Bragg reflections below ${T}_{N}$, but widens abruptly at $T={T}_{N}$ with the simultaneous increase of intensity. The correlation length of the antiferromagnetic fluctuations just above ${T}_{N}$ is of the order of $10\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$. The peak intensity decreases to zero at $T\ensuremath{\approx}7\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ with no visible anomaly at the antiferroquadrupolar-ordering temperature ${T}_{Q}\ensuremath{\approx}3.3\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The features of the magnetic peak $(\frac{1}{2},\frac{1}{2},\frac{1}{2})$ are typical for the itinerant magnetism. Interacting multipole moments may also give a contribution to this peak.

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