Abstract
dc and ac magnetic measurements combined with M\"ossbauer spectroscopy have been used to study the evolution of magnetic order below the critical temperature ${\mathit{T}}_{\mathit{c}}$ in polycrystalline powders of the intermetallic compounds ${\mathrm{YFe}}_{10}$${\mathrm{Mo}}_{2}$ and ${\mathrm{LuFe}}_{10}$${\mathrm{Mo}}_{2}$. Irreversibility of the dc thermomagnetic curves after zero-field-cooling (ZFC) and field-cooling (FC) processes has been observed. A hysteresis loop has been detected for both compounds at 4.5 K and a shifting of the loop after FC has been observed in ${\mathrm{LuFe}}_{10}$${\mathrm{Mo}}_{2}$. Strong spin-relaxation effects were recorded in $^{57}\mathrm{Fe}$ M\"ossbauer absorption spectra in temperatures well below the ${\mathit{T}}_{\mathit{c}}$=360 and 260 K for R=Y and Lu alloys, respectively. Furthermore, a number of magnetic properties common to conventional spin glasses and true ferromagnets has been revealed, which suggest the existence of a spin-glass-like magnetic phase below ${\mathit{T}}_{\mathit{c}}$.
Published Version
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