Magnetic measurements ofCeAl3to below 1 mK

The magnetic susceptibility of a polycrystalline, single-phase sample of ${\mathrm{CeAl}}_3$ has been measured from 10 K to below 800 μK. Above 40 mK, the temperature dependence of the susceptibility is consistent with the results of other groups and possesses a broad peak around 500 mK. Using standard rf superconducting-quantum-interference-device detection techniques operating at 16 Hz, the sample, which was located in a shielded environment having a residual static field of less than 2 nT, was not observed to show any magnetic anomaly from 40 mK down to the lowest achievable temperature.