Keywords
$\mathrm{Ca^{2+}}$
$\mathrm{Y_2Ca_\mathit{x}FeTaO_7}$
canted antiferromagnets
Dzyaloshinskii–Moriya interaction.
solid solutions
spin-reorientation transition
Abstract
The existence of $\mathrm{Y_{2-\mathit{x}}Ca_\mathit{x}FeTaO_{7-\delta}}$
solid solutions ($\mathit{x}$ = 0 -- 0.075) with a pyrochlore-like layered structure was established. The appearance of the magnetic properties characteristic for canted antiferromagnets was observed as a result of structure distortions (space group ${R\overline{\mathrm{3}}}$ $\to$ space group $P\mathrm{3_121}$ associated with a change of composition.
$\mathrm{Y_{2-\mathit{x}}Ca_\mathit{x}FeTaO_{7-\delta}}$ exhibits ferromagnetic properties already at 300 K.
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