第一性原理分析揭示UPt $_3$中奇异的多能隙结构
Exotic multi-gap structure in UPt$_3$ unveiled by the first-priniciples analysis
摘要：
重费米子超导体UPt $_3$是一种独特的具有多超导相的自旋三重态超导体。在这里，我们提供了第一个报告的微观超导能隙结构的第一性原理分析。我们发现，有希望的间隙结构是一个前所未有的$E_{2u}$状态，这是完全不同于以前的唯象$E_{2u}$模型。我们得到的$E_{2u}$态在小费米面上具有面内双重垂直线节点，在大费米面上具有线性色散的点节点。这些特殊的特征不能用传统的自旋$1/2$表示来解释，但可以用总角动量$j=5/2$空间中库珀对的群论表示来描述。我们的发现为解决UPt $_3$超导性中长期存在的问题提供了新的思路
英文摘要：
A heavy-fermion superconductor UPt$_3$ is a unique spin-triplet superconductor with multiple superconducting phases. Here we provide the first report on the first-principles analysis of the microscopic superconducting gap structure. We find that the promising gap structure is an unprecedented $E_{2u}$ state, which is completely different from the previous phenomenological $E_{2u}$ models. Our obtained $E_{2u}$ state has in-plane twofold vertical line nodes on small Fermi surfaces and point nodes with linear dispersion on a large Fermi surface. These peculiar features cannot be explained in the conventional spin $1/2$ representation, but is described by the group-theoretical representation of the Cooper pairs in the total angular momentum $j=5/2$ space. Our findings shed new light on the long-standing problems in the superconductivity of UPt$_3$
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