Dimensional crossover of quantum critical behavior in CeCoIn$_5$

Details Dimensional crossover of quantum critical behavior in CeCoIn$_5$ Dimensional crossover of quantum critical behavior in CeCoIn$_5$

2007-04-04

arxiv.org/abs/0704.0506v2

Phys. Rev. Lett. 100, 136401 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.100.136401

The nature of quantum criticality in CeCoIn$_5$ is studied by low-temperature thermal expansion $\alpha(T)$. At the field-induced quantum critical point at H=5 T a crossover scale $T^\star\approx 0.3$ K is observed, separating $\alpha(T)/T\propto T^{-1}$ from a weaker $T^{-1/2}$ divergence. We ascribe this change to a crossover in the dimensionality of the critical fluctuations which may be coupled to a change from unconventional to conventional quantum criticality. Disorder, whose effect on quantum criticality is studied in CeCoIn$_{5-x}$Sn$_x$ ($0\leq x\leq 0.18$), shifts $T^\star$ towards higher temperatures.

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