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• W1991707233 abstract "The antiferromagnetic, intermetallic compounds $mathrm{Ti}{mathrm{Fe}}_{2}$ and $({mathrm{Hf}}_{0.80}{mathrm{Ta}}_{0.20}){mathrm{Fe}}_{2}$ with the C14 Laves phase crystalline structure have been investigated with Mossbauer spectroscopy under applied magnetic fields in order to determine whether Fe atoms at the $2a$ site carry a paramagnetic moment. $mathrm{Ti}{mathrm{Fe}}_{2}$ was measured at $T=4.2phantom{rule{0.3em}{0ex}}mathrm{K}$ in various fields up to $12phantom{rule{0.3em}{0ex}}mathrm{T}$. While the Fe($6h$) effective field behaved in the expected way for an antiferromagnet in an external field, the Fe($2a$) effective field was identical to the applied field, thus evidencing the absence of a local moment. $({mathrm{Hf}}_{0.80}{mathrm{Ta}}_{0.20}){mathrm{Fe}}_{2}$ is antiferromagnetic only in a limited temperature range, so the experiments were carried out at or above $T=220phantom{rule{0.3em}{0ex}}mathrm{K}$. For this sample the measured Fe($2a$) effective field was smaller than the applied field, revealing a hyperfine contribution from which an Fe moment of $ensuremath{sim}0.6phantom{rule{0.3em}{0ex}}{ensuremath{mu}}_{B}$ was estimated. The occurrence of stronger spin fluctuations in $({mathrm{Hf}}_{0.80}{mathrm{Ta}}_{0.20}){mathrm{Fe}}_{2}$ than in $mathrm{Ti}{mathrm{Fe}}_{2}$, as revealed by electronic-specific heat data, is proposed as an explanation for the different magnetic behaviors of these two isostructural compounds." @default.
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• W1991707233 date "2005-03-22" @default.
• W1991707233 modified "2023-10-03" @default.
• W1991707233 title "Magnetic moment at highly frustrated sites of antiferromagnetic Laves phase structures" @default.
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• W1991707233 doi "https://doi.org/10.1103/physrevb.71.104412" @default.
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