层状CeRhIn_{5-x} Sn_x与立方CeIn $_{3-x}Sn_x的量子临界性比较
Quantum criticality in layered CeRhIn_{5-x}Sn_x compared with cubic CeIn$_{3-x}Sn_x
摘要：
本文报道了{ \it层状}重费米子系统\cri（$0.3\leq x \leq 0.6$）单晶的低温热膨胀测量结果，并与相关的{ \it立方}系统\ci [R. Küchler { \it等}，物理修订版信函{ \bf 96}，256403（2006）]。这两个系统显示量子临界点证明了一个发散的格吕奈森比。最值得注意的是，三维巡回模型解释了{ \it both}系统中的量子临界性，表明\cri中的晶体各向异性并不重要。这是由于在这些掺杂系统中的弱无序的效果。
英文摘要：
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. Küchler {\it et al.}, Phys. Rev. Lett. {\bf 96}, 256403 (2006)]. 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 {\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.
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