Abstract
The phase relations of the GdCo13−xSix system have been studied by means of scanning microscopy, microprobe analysis and x-raydiffraction. Single-phase samples (structure type LaFe9Si4 with space group I4/mcm) are formed in a narrow composition range|δ|≤0.2,where GdCo9Si4 forms as a fully ordered ternary compound. The magnetic properties ofGdCo9Si4 have been investigated by ac susceptibility, magnetization, specific heat and resistivitymeasurements. These experiments reveal ferrimagnetism below about 47 K, which isanalysed in terms of a two-sublattice molecular field model with a local moment Gdsubsystem coupling antiparallel to the itinerant ferromagnetic Co 3d sublattice. The 3d–3dexchange of the latter is the driving force for the onset of long range magnetic order. Thevalidity of the two-sublattice model is demonstrated by high field measurements, showingthat the ferrimagnetic coupling starts to break up at a lower critical field . The magnetic ground state ofGdCo9Si4 has been analysed on a microscopic basis via LSDA electronic structure calculations.
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