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Abstract:
Structural, magnetic, and thermal measurements performed on CeCo1-xFexSi
alloys are reported. Three regions can be recognized: (i) Co rich (x <=
0.20) with a decreasing long-range antiferromagnetic order which
vanishes at finite temperatures, (ii) an intermediate region (0.20 < x
<= 0.30) showing a broad magnetic anomaly (C-A) in specific heat, and
(iii) the nonmagnetic region progressively changing from a
non-Fermi-liquid-type behavior towards a Fermi-liquid one as Fe
concentration increases. The C-A anomaly emerges as an incipient
contribution above T-N already at x = 0.10, which indicates that this
contribution is related to short-range correlations likely of
quasi-two-dimensional type. Both T-N transition and C-A anomaly are
practically unaffected by an applied magnetic field up to B approximate
to 10 T.
