Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka 804-8550, Japan.
J Phys Condens Matter. 2012 Jul 25;24(29):294208. doi: 10.1088/0953-8984/24/29/294208. Epub 2012 Jul 6.
A new universality class of quantum criticality emerging in itinerant electron systems with strong local electron correlations is discussed. The quantum criticality of a Ce- or Yb-valence transition gives us a unified explanation for unconventional criticality commonly observed in heavy fermion metals such as YbRh(2)Si(2), β-YbAlB(4), YbCu(5-x)Al(x), and CeIrIn(5). The key origin is due to the locality of the critical valence fluctuation mode emerging near the quantum critical end point of the first-order valence transition, which is caused by strong electron correlations for f electrons. The wider relevance of this new criticality and important future measurements to uncover its origin are also discussed.
讨论了在具有强局域电子关联的巡游电子系统中出现的新的量子临界点普适类。Ce 或 Yb 价态跃迁的量子临界点为我们提供了一个统一的解释，用于解释在重费米子金属（如 YbRh2Si2、β-YbAlB4、YbCu5-xAlx 和 CeIrIn5）中普遍观察到的非常规临界点。关键的起源是由于在一阶价态跃迁的量子临界点附近出现的临界价态涨落模式的局域性，这是由于 f 电子的强电子相关性引起的。还讨论了这种新的临界点的更广泛的相关性和揭示其起源的重要未来测量。
