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Summary: Critical Phenomena and the Quantum Critical Point of Ferromagnetic Zr1ÿxNbxZn2
D. A. Sokolov,1
M. C. Aronson,1
W. Gannon,1
and Z. Fisk2,*
1
University of Michigan, Ann Arbor, Michigan 48109-1120, USA
2
Florida State University, Tallahassee, Florida 32310-3706, USA
(Received 6 December 2005; published 24 March 2006)
We present a study of the magnetic properties of Zr1ÿxNbxZn2, using an Arrott plot analysis of the
magnetization. The Curie temperature TC is suppressed to zero temperature for Nb concentration xC
0:083 0:002, while the spontaneous moment vanishes linearly with TC as predicted by the Stoner theory.
The initial susceptibility displays critical behavior for x xC, with a critical exponent which smoothly
crosses over from the mean field to the quantum critical value. For high temperatures and x xC, and for
low temperatures and x xC we find that ÿ1
ÿ1
0 aT4=3
, where ÿ1
0 vanishes as x ! xC. The
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