V. Fritsch, N. Bagrets, G. Goll, W. Kittler, M. J. Wolf, K. Grube, C. -L. Huang, H. v. Löhneysen
In the antiferromagnetic (AF) heavy-fermion system system CePdAl the magnetic Ce ions form a network of equilateral triangles in the (001) plane, similar to the kagom\'e lattice, with one third of the Ce moments not participating in the long-range order. The N\'eel temperature TN = 2.7 K is reduced upon replacing Pd by Ni in CePd(1-x)Ni(x)Al, with TN -> 0 for x = 0.144. At this concentration the specific heat C exhibits a C/T ~ - log T dependence. Within the Hertz-Millis-Moriya model of quantum criticality, this behavior might indicate 2D critical antiferromagnetic fluctuations, which might arise from the decoupling of the 3D magnetic order by frustration. On the other hand the simultaneous presence of Kondo effect and magnetic geometric frustration might entail a new route to quantum criticality.
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http://arxiv.org/abs/1301.6062
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