Abstract

We present a polarized neutron scattering study on the magnetic fluctuations on a powder sample of the SrCr 8Ga 4O 19 compound. We use the D7 instrument at the ILL with the classical xyz-polarization analysis as well as time-of-flight analysis with Δ E≈1 meV energy resolution. We extract the true magnetic scattering over a broader temperature range than that earlier examined in other studies. The results show that the broadly peaked Q-dependence observed in the elastic response at low T⩽2 K persists in the dynamic signal up to T⩽50 K. At higher temperatures the peak broadens further into a structureless, paramagnetic like Q-dependence. Our data shows that the short-ranged dynamic AF correlations prevail up to a much higher temperature range than what had been earlier observed.

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