Unstable magnetic ordering in Ce(Fe 1− y X y ) 2, X = Al, Ga, Si, Ru, Co

We performed X-ray diffraction, L 2 edge X-ray absorption, and Mössbauer measurements on CeFe 2 and pseudobinaries Ce(Fe 1− y X y ) 2 as well as on their hydrides to investigate the magnetic ordering in these materials. While the hydrides order ferromagnetically in the whole temperature range below T c, the magnetic ordering type of the pseudobinaries in the low-temperature antiferromagnetic phase is found to be much more complex.