Volume 87, Number 5, September 2009
Article Number 57011
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 24 September 2009
EPL, 87 (2009) 57011
DOI: 10.1209/0295-5075/87/57011

Quantum criticality in layered CeRhIn5-xSnx compared with cubic CeIn3-xSnx

J. 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 $\leqslant$ x $\leqslant$ 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.

© EPLA 2009