Abstract
${}^{57}\mathrm{Fe}$ and ${}^{119}\mathrm{Sn}$ M\"ossbauer spectroscopy has been used to study local spin correlations in site-frustrated $a\ensuremath{-}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}{)}_{78}{\mathrm{Sn}}_{2}{\mathrm{Si}}_{6}{\mathrm{B}}_{14}$ alloys. Comparison of total magnetization, hyperfine fields at the magnetic Fe, and nonmagnetic Sn sites shows that the Mn moments order antiparallel to the majority Fe moments and that the order established at the transverse spin freezing transition, ${T}_{\mathrm{xy}},$ exhibits strong antiferromagnetic correlations in the plane perpendicular to the ferromagnetic axis. This result stands in strong contrast with the bond-frustrated case of $a\ensuremath{-}{\mathrm{Fe}}_{100\ensuremath{-}x}{\mathrm{Zr}}_{x},$ but is fully consistent with recent numerical simulations of short-ranged models. The clear difference between site- and bond-frustrated systems below ${T}_{\mathrm{xy}}$ demonstrates the importance of short-range interactions in real spin-glass systems.
Published Version
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