Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-18
Eur. Phys. Lett. 87 (2009) 57011.
Physics
Condensed Matter
Strongly Correlated Electrons
Eur. Phys. Lett., to be published
Scientific paper
10.1209/0295-5075/87/57011
We report low-temperature thermal-expansion measurements on single crystals of the {\it layered} heavy fermion system \cri ($0.3\leq x \leq 0.6$) and compare it with a previous study on the related {\it cubic} system \ci [R. K\"{u}chler {\it et al.}, Phys. Rev. Lett. {\bf 96}, 256403 (2006)]. Both systems display a quantum critical point as proven by a divergent Gr\"uneisen ratio. Most remarkably, the three-dimensional itinerant model explains quantum criticality in {\it both} systems, suggesting that the crystalline anisotropy in \cri is unimportant. This is ascribed to the effect of weak disorder in these doped systems.
Bauer Eric D.
Donath J. G.
Gegenwart Philip
Ronning Filip
Sarrao John L.
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