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Abstract:
The ground state of three CeTMX2 compounds with CeNiSi2 structure type
was investigated by electrical-resistivity, magnetic-susceptibility and
specific-heat measurements. Whereas CeNiSi2 is an intermediate-valent
system, we observe in CePtSi2 and CeNiGe2 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.