Title of article :
An unusual interplay among disorder, Kondo-effect and spin-glass behavior in the Kondo lattices, Ce2Au1−xCoxSi3
Author/Authors :
Majumdar، نويسنده , , S and Sampathkumaran، نويسنده , , E.V and Berger، نويسنده , , St and Della Mea، نويسنده , , M and Michor، نويسنده , , H and Bauer، نويسنده , , E and Brando، نويسنده , , M and Hemberger، نويسنده , , J and Loidl، نويسنده , , A، نويسنده ,
Abstract :
We report the results of magnetic measurements for the solid solution Ce2Au1−xCoxSi3. 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 antiferromagnetic 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.
