Abstract

The ground state of three CeTMX 2 compounds with CeNiSi 2 structure type was investigated by electrical-resistivity, magnetic-susceptibility and specific-heat measurements. Whereas CeNiSi 2 is an intermediate-valent system, we observe in CePtSi 2 and CeNiGe 2 magnetic ordering in the presence of heavy fermions. The trends in heavy-fermion formation on going from either the 111 or 122 to the 112 compounds are discussed.

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