SMALL-ANGLE NEUTRON-SCATTERING STUDIES OF CE(FE1-XALX)(2) AT HIGH-TEMPERATURES

Small-angle neutron scattering (SANS) experiments have been carried out on Ce(Fe1-xAlx)(2) with x = 0, 0.06 and 0.14 to study the ferromagnetic instability in the pure compound, to small amounts of magnetic impurities. The temperature range was 300-710 K and the scattering configuration was in the low resolution with scattering wave vectors larger than 0.02 Angstrom(-1). The increase in measured susceptibility near 600 K indicates high-temperature transitions for x = 0 and 0.06. For x = 0.14, an anomalous increase of the integrated SANS intensity appears at 350 K and the measured scattering pattern shows non-diverging susceptibility with short-range magnetic interaction at this transition temperature.