Quantum criticality in layered CeRhIn5-xSnx compared with cubic CeIn3-xSnxJ. G. Donath1, F. Steglich1, E. D. Bauer2, F. Ronning2, J. L. Sarrao2 and P. Gegenwart3
1 Max-Planck-Institute for Chemical Physics of Solids - D-01187 Dresden, Germany, EU
2 Los Alamos National Laboratory - Los Alamos, NM 87545, USA
3 I. Physik. Institut, Georg-August-Universität Göttingen - D-37077 Göttingen, Germany, EU
received 26 August 2009; accepted in final form 2 September 2009; published September 2009
published online 24 September 2009
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 (KÜCHLER R. et al., Phys. Rev. Lett., 96 (2006) 256403). Both systems display a quantum critical point as proven by a divergent Grüneisen 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.
71.10.Hf - Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems.
71.27.+a - Strongly correlated electron systems; heavy fermions.
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