Mihael S Grbić, Eoin C T O'Farrell, Yosuke Matsumoto, Kentaro Kuga, Manuel Brando, Robert Küchler, Andriy H Nevidomskyy, Makoto Yoshida, Toshiro Sakakibara, Yohei Kono, Yasuyuki Shimura, Michael L Sutherland, Masashi Takigawa, Satoru Nakatsuji
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引用次数: 0
Abstract
Intermetallic compounds containing f-electron elements have been prototypical materials for investigating strong electron correlations and quantum criticality (QC). Their heavy fermion ground state evoked by the magnetic f-electrons is susceptible to the onset of quantum phases, such as magnetism or superconductivity, due to the enhanced effective mass (m*) and a corresponding decrease of the Fermi temperature. However, the presence of f-electron valence fluctuations to a non-magnetic state is regarded an anathema to QC, as it usually generates a paramagnetic Fermi-liquid state with quasiparticles of moderate m*. Such systems are typically isotropic, with a characteristic energy scale T0 of the order of hundreds of kelvins that require large magnetic fields or pressures to promote a valence or magnetic instability. Here we show the discovery of a quantum critical behaviour and a Lifshitz transition under low magnetic field in an intermediate valence compound α-YbAlB4. The QC origin is attributed to the anisotropic hybridization between the conduction and localized f-electrons. These findings suggest a new route to bypass the large valence energy scale in developing the QC.
含有 f 电子元素的金属间化合物一直是研究强电子关联和量子临界(QC)的典型材料。由于有效质量(m*)的增强和费米温度的相应降低,磁性 f 电子唤起的重费米子基态容易导致磁性或超导性等量子相的出现。然而,非磁态 f 电子价态波动的存在被认为是量子相位的天敌,因为它通常会产生具有中等 m* 准粒子的顺磁费米液体态。这种系统通常是各向同性的,其特征能级 T0 为数百开尔文,需要大磁场或压力来促进价态或磁态不稳定性。在这里,我们发现了中间价化合物 α-YbAlB4 在低磁场下的量子临界行为和 Lifshitz 转变。量子临界源于传导电子和局部 f 电子之间的各向异性杂化。这些发现为发展 QC 提出了一条绕过大价态能级的新途径。
期刊介绍:
FEBS Letters is one of the world''s leading journals in molecular biology and is renowned both for its quality of content and speed of production. Bringing together the most important developments in the molecular biosciences, FEBS Letters provides an international forum for Minireviews, Research Letters and Hypotheses that merit urgent publication.