Abstract
Abstract Investigations made by susceptibility measurements and neutron diffraction experiments are reported on the ternary silicides RFeSi (RLa-Sm, Gd-Dy) with the tetragonal CeFeSi-type structure (space group, P4/nmm ). This structure, which is closely related to the ThCr 2 Si 2 - and TbFeSi 2 -type structures, can be described as isolated ThCr 2 Si 2 blocks connected via R-R contacts. LaFeSi and CeFeSi are Pauli paramagnets, whereas PrFeSi is a Curie-Weiss paramagnet down to 2 K. The other compounds are ferromagnetic below T C = 25, 40, 135, 125 and 110 K for neodymium, samarium, gadolinium, terbium and dysprosium respectively. With the exception of GdFeSi, these compounds exhibit rather large coercive fields at 4.2 K (up to 9 kOe for terbium). Neutron diffraction experiments on RFeSi (R Nd, Tb, Dy) led to the determination of collinear ferromagnetic structures with magnetic moments (with values close to the theoretical free ion values) localized on R ions only and aligned along the c axis. The results are discussed and compared with those of closely related RFe 2 Si 2 and RFeSi 2 compounds.
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