锕系元素UCoGa $_5$中高能色散异常形成的成象
Imaging the formation of high-energy dispersion anomalies in the actinide UCoGa$_5$
摘要：
我们使用角分辨光电子能谱（ARPES）图像的出现实质性的色散异常的电子重整化的锕系化合物UCoGa $_5$，这被认为是属于一个传统的费米液体家庭。扭结或突变的准粒子色散的斜率检测在低（$\sim$ 130毫电子伏）和高（$\sim$ 1 eV）的费米能量以下的结合能，排除任何显着的贡献的声子。我们进行了数值计算，以证明巡游费米子和自旋波动所产生的粒子-空穴连续的自旋轨道分裂$5f$状态的铀之间的耦合的异常是充分描述。这些异常类似于高温氧化铜超导体的“瀑布”现象，表明自旋涨落是相关材料中多种形式电子相的一般途径，如高温超导体和锕系元素。
英文摘要：
We use angle-resolved photoemission spectroscopy (ARPES) to image the emergence of substaintial dispersion anomalies in the electronic renormalization of the actinide compound UCoGa$_5$ which was presumed to belong to a conventional Fermi liquid family. Kinks or abrupt breaks in the slope of the quasiparticle dispersion are detected both at low ($\sim$130 meV) and high ($\sim$1 eV) binding energies below the Fermi energy, ruling out any significant contribution of phonons. We perform numerical calculations to demonstrate that the anomalies are adequately described by coupling between itinerant fermions and spin fluctuations arising from the particle-hole continuum of the spin-orbit split $5f$ states of uranium. These anomalies are resemble the `waterfall' phenomenon of the high-temperature copper-oxide superconductors, suggesting that spin fluctuations are a generic route toward multiform electronic phases in correlated materials as different as high-temperature superconductors and actinides.
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