Abstract and subjects
We report low-temperature thermal-expansion measurements on single crystals of the layered heavy fermion system CeRhIn5-xSnx (0.3 <= x <= 0.6) and compare it with a previous study on the related cubic system CeIn3-xSnx (Kuchler R. et al., Phys. Rev. Lett., 96 ( 2006) 256403). Both systems display a quantum critical point as proven by a divergent Gruneisen ratio. Most remarkably, the three-dimensional itinerant model explains quantum criticality in both systems, suggesting that the crystalline anisotropy in CeRhIn5-xSnx is unimportant. This is ascribed to the effect of weak disorder in these doped systems. Copyright (C) EPLA, 2009