Six closely related YbT2Zn20 (T = Fe, Co, Ru, Rh, Os, Ir) heavy fermion compounds with large local moment degeneracy
Six closely related YbT2Zn20 (T = Fe, Co, Ru, Rh, Os, Ir) heavy fermion compounds with large local moment degeneracy
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DOI：
10.1073/pnas.0702757104
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发表时间：
2007-06-12
影响因子：
11.1
通讯作者：
Canfield, P. C.
中科院分区：
文献类型：
--
作者：
Torikachvili, M. S.;Jia, S.;Canfield, P. C.
重费米子化合物代表了电子物质最强烈的相关形式之一，并产生了从小矩有序到奇异超导的低温状态，这两种状态通常都接近量子临界点。这些强电子相关性与从局部力矩自由度到传导电子的熵转移有关，因此，与（原始）力矩承载离子的低温简并密切相关。在这里，我们报告了六个密切相关的钇基重费米子化合物YbT2Zn20的发现，它们是稀稀土化合物RT2Zn20 （T = Fe, Co, Ru, Rh, Os, Ir）大家庭的成员。这一发现使镱基重费米子物质的总数增加了一倍。考虑到这些化合物的稀释性质，T的系统变化只会对Yb位点产生微弱的扰动，并允许深入了解简并对这些模型相关电子系统的热力学和输运性质的影响。
Heavy fermion compounds represent one of the most strongly correlated forms of electronic matter and give rise to low temperature states that range from small moment ordering to exotic superconductivity, both of which are often in close proximity to quantum critical points. These strong electronic correlations are associated with the transfer of entropy from the local moment degrees of freedom to the conduction electrons, and, as such, are intimately related to the low temperature degeneracy of the (originally) moment bearing ion. Here we report the discovery of six closely related Yb-based heavy fermion compounds, YbT2Zn20, that are members of the larger family of dilute rare earth bearing compounds: RT2Zn20 (T = Fe, Co, Ru, Rh, Os, Ir). This discovery doubles the total number of Yb-based heavy fermion materials. Given these compounds' dilute nature, systematic changes in T only weakly perturb the Yb site and allow for insight into the effects of degeneracy on the thermodynamic and transport properties of these model correlated electron systems.