Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany.
Phys Rev Lett. 2012 Dec 7;109(23):236405. doi: 10.1103/PhysRevLett.109.236405. Epub 2012 Dec 4.
The filled skutterudite compound CePt(4)Ge(12) is situated close to the border between the intermediate valence of Ce and heavy-fermion behavior. Substitution of Ge by Sb drives the system into a strongly correlated and, ultimately, upon further increasing the Sb concentration, an antiferromagnetically ordered state. Our experiments evidence a delicate interplay of emerging Kondo physics and the formation of a local 4f moment. An extended non-Fermi-liquid region, which can be understood in the framework of a Kondo-disorder model, is observed. Band-structure calculations support the conclusion that the physical properties are governed by the interplay of electron supply via Sb substitution and the concomitant volume effects.
填充的 skutterudite 化合物 CePt(4)Ge(12) 位于 Ce 的中间价态和重费米子行为之间的边界附近。通过用 Sb 取代 Ge，该系统进入强相关状态，并且最终，随着 Sb 浓度的进一步增加，进入反铁磁有序状态。我们的实验证明了新兴的康多物理学和局部 4f 矩的形成之间的微妙相互作用。在康多无序模型的框架内，可以理解观察到的扩展非费米液体区域。能带结构计算支持这样的结论，即通过 Sb 取代提供电子和伴随的体积效应的相互作用来控制物理性质。
