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Inelastic neutron scattering (INS) and specific heat measurements have beenperformed on the intermediate valence compound CeRuSi$_3$, which isisostructural to the noncentrosymmetric pressure-induced superconductorsCeRhSi$_3$, CeIrSi$_3$ and CeCoGe$_3$. INS measurements at 7~K reveal a broadpeak at (58.5~$\pm$~1.4)~meV, while at 300~K, broad quasielastic scattering isobserved. This indicates a large Kondo temperature of $T_{\rm K}~\sim~680$~K.The magnetic contribution to the specific heat ($C_{\rm mag}$) has a value of$\gamma~=~62.5(1)$~mJ/mol~K$^2$ at low temperatures and above about 100~K canbe well accounted for by the Coqlbin-Schrieffer model with a characteristictemperature of $T_0$~=~680~K, which is further evidence that CeRuSi$_3$ is inthe intermediate valence regime.

Evidence for a hybridization gap in noncentrosymmetric CeRuSi3