Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-12-12
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures. Submitted to Physical Review Letters
Scientific paper
10.1103/PhysRevLett.96.116404
We present a study of the magnetic properties of Zr1-xNbxZn2, 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 chi 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 chi^(-1)=chi_o^(-1)+aT^(4/3), where chi_o^(-1) vanishes as x approaches xC. The resulting magnetic phase diagram shows that the quantum critical behavior extends over the widest range of temperatures for x=xC, and demonstrates how a finite transition temperature ferromagnet is transformed into a paramagnet, via a quantum critical point.
Aronson Meigan C.
Fisk Zach
Gannon W.
Sokolov Dmitry A.
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