TY - JOUR
T1 - Approaching quantum criticality in a partially geometrically frustrated heavy-fermion metal
AU - Fritsch, V.
AU - Bagrets, N.
AU - Goll, G.
AU - Kittler, W.
AU - Wolf, M. J.
AU - Grube, K.
AU - Huang, C. L.
AU - Löhneysen, H. V.
PY - 2014/2/18
Y1 - 2014/2/18
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.89.054416
DO - 10.1103/PhysRevB.89.054416
M3 - Article
AN - SCOPUS:84897621325
VL - 89
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 5
M1 - 054416
ER -