Abstract
We have examined the ground-state properties of the putative intermediate valency and/or charge density wave (CDW) system ${\mathrm{Yb}}_{5}{\mathrm{Ir}}_{4}{\mathrm{Si}}_{10}$ via resistivity, specific heat, magnetic susceptibility, and x-ray absorption spectroscopy. The bulk properties confirm a CDW-type anomaly at $48\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, but show that all the Yb ions are in an integral trivalent $4{f}^{13}$ state. Additionally, our low-temperature measurements reveal two magnetic transitions at 2.3 and $1.1\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, respectively. The compound shows Kondo-lattice-type behavior that might be responsible for the weak-coupling nature of the CDW evidenced by the specific heat data.
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