Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-03-30
Solid State Commun. 121 (2002) 665
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures
Scientific paper
10.1016/S0038-1098(02)00053-4
We report the results of magnetic measurements for the solid solution Ce$_2$Au$_{1-x}$Co$_x$Si$_3$. The results reveal that this solid solution is characterized by a magnetic phase diagram (plot of magnetic transition temperature versus $x$) unusual for Kondo lattices. In particular, the spin-glass freezing induced by disorder is observed only for the compositions at the weak coupling limit; as one approaches the quantum critical point by a gradual replacement of Au by Co, this disorder effect is surprisingly suppressed in favor of long range antiferro-magnetic ordering in contrast to expectations. This unusual interplay between disorder, spin-glass freezing and the Kondo-effect calls for further refinement of theories on competition between magnetism and the Kondo effect.
Bauer Eckhard
Berger St.
Brando Manuel
Hemberger Joachim
Loidl Alois
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