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Zusammenfassung:
We present experimental results for the lattice dynamics in UPt3 and for the electronic specific heat in UPt3 and URu2Si2, which, together with already published similar results for UBe13, indicate that for the actinide-based heavy-fermion superconductors, the normal ground-state is that of localized 5f-electrons and the heavy-fermion properties are due to a low-T Kondo resonance.