An unusual interplay among disorder, Kondo-effect and spin-glass behavior in the Kondo lattices, Ce$_2$Au$_{1-x}$Co$_x$Si$_3$

Subham Majumdar; E. V. Sampathkumaran; St. Berger; M. Della Mea; H. Michor; E. Bauer; M. Brando; J. Hemberger; A. Loidl

doi:10.1016/S0038-1098(02)00053-4

paper

An unusual interplay among disorder, Kondo-effect and spin-glass behavior in the Kondo lattices, Ce $_{2}$ Au $_{1 - x}$ Co $_{x}$ Si $_{3}$

arXiv:cond-mat/0204008 · doi:10.1016/S0038-1098(02)00053-4

Abstract

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.

4 pages, 3 figures

An unusual interplay among disorder, Kondo-effect and spin-glass behavior in the Kondo lattices, Ce2​Au1−x​Cox​Si3​

Abstract

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An unusual interplay among disorder, Kondo-effect and spin-glass behavior in the Kondo lattices, Ce $_{2}$ Au $_{1 - x}$ Co $_{x}$ Si $_{3}$