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Detailed $^{195}$Pt- and $^{171}$Yb nuclear magnetic resonance (NMR) studieson the heterogeneous mixed valence system YbPtGe$_2$ are reported. Thetemperature dependence of the $^{195}$Pt-NMR shift $^{195}K(T)$ indicates theopening of an unusual magnetic gap below 200\,K. $^{195}K(T)$ was analyzed by athermal activation model which yields an isotropic gap $\Delta/k_B \approx200$\,K. In contrast, the spin-lattice relaxation rate $^{195}$($1/T_1$) doesnot provide evidence for the gap. Therefore, an intermediate-valence picture isproposed while a Kondo-insulator scenario can be excluded. Moreover,$^{195}$($1/T_1$) follows a simple metallic behavior, similar to the referencecompound YPtGe$_2$. A well resolved NMR line with small shift is assigned todivalent $^{171}$Yb. This finding supports the proposed model with two sub-setsof Yb species (di- and trivalent) located on the Yb2 and Yb1 site of theYbPtGe$_2$ lattice.

Unconventional magnetism in multivalent charge-ordered YbPtGe$_2$ probed by $^{195}$Pt- and $^{171}$Yb-NMR