Abstract
Structural, thermal, magnetic, transport, and Ce ${L}_{3}$-edge spectroscopic measurements on the Ce(${\mathrm{Mn}}_{\mathrm{x}}$${\mathrm{Cr}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${)}_{2}$${\mathrm{Si}}_{2}$ series are presented. These results all indicate that Cr substitution drives this system from a mixed-valent Ce state at x=1.0 to a Kondo or heavy-fermion state with increasing x. The reflection of the Ce valence-state variation (from ${L}_{3}$ measurements) in the electronic specific heat coefficient and lattice parameters is discussed. The magnetic and transport measurements indicate that the Ce spin-flip scattering processes (i.e., the Kondo effect) apparently thrive within the Mn-moment antiferromagnetically ordered phase of these compounds.
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