Abstract
We report the electrical transport properties of ${\mathrm{Yb}}_{14}{\mathrm{MnSb}}_{11}$, resistivity and thermoelectric power under pressures up to $2.3\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. In both transport coefficients we can follow the ferromagnetic transition, which shows a shift from the ambient pressure value of $52\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ to lower temperatures and eventually saturation at $49\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ for $p>2.0\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. The high values of thermopower and its linear temperature dependence down to $100\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ demonstrate that the system is a bad metal. Anomalies in the thermopower below the ferromagnetic transition are rather sensitive to pressure. Our experimental observations are consistent with the model of an underscreened Kondo lattice.
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