In the antiferromagnetic (AF) heavy-fermion system CePdAl the magnetic Ce ions form a network of equilateral triangles in the (001) plane, similar to the kagomé lattice, with one third of the Ce moments not participating in the long-range order. The Néel temperature TN=2.7K is reduced upon replacing Pd by Ni in CePd1-xNixAl, with TN→0 for x=0.144, where the specific heat C exhibits a C/Tâ̂-logT dependence. Within the Hertz-Millis-Moriya model of quantum criticality, this behavior might indicate 2D critical antiferromagnetic fluctuations arising from the decoupling of 3D magnetic order by frustration. On the other hand, the simultaneous presence of Kondo effect and geometric frustration might entail a different route to quantum criticality.
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 2014 二月 18|
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