NUKLEONIKA 2004, 49(Supplement 3):s33-s36
Piotr Gaczyñski, Henryk Drulis
W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences,
2 Okólna Str., P. O. Box 1410, 50-950 Wroc³aw 2, Poland
57Fe Mössbauer spectra of YbFe4Al8 of the tetragonal ThMn12
structure have been investigated. Mössbauer measurements at the lowest temperatures yield information
on the iron population in three crystallographic sites 8f, 8j and 8i available for Fe atoms. The
obtained results indicate on the coexistence of magnetically ordered and paramagnetic-like Fe
moments within antiferromagnetic phase of YbFe4Al8. The MS measurements show
that the onset of short range antiferromagnetic interaction in the Fe sublattice takes place at 220 K.