Exotic multi-gap structure in UPt3 unveiled by the first-priniciples analysis
Exotic multi-gap structure in UPt3 unveiled by the first-priniciples analysis
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第一性原理分析揭示了 UPt3 中奇异的多间隙结构
DOI：
10.1103/physrevlett.117.217002
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
H. Ikeda
中科院分区：
文献类型：
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作者：
T. Nomoto;H. Ikeda
重费米子超导体是一种独特的具有多个超导相的自旋三重态超导体。在这里，我们提供了第一份关于微观超导带隙结构的第一性原理分析的报告。我们发现，这种有前景的能隙结构是一种前所未有的状态，这与以往的现象学模型完全不同。我们得到的态在小费米面上有面内两个垂直线节点，在大费米面上有线性色散的点节点。这些奇特的特征不能用传统的自旋表象来解释，而是用库珀对在总角动量空间中的群论表象来描述。我们的发现为解决超导中长期存在的问题提供了新的线索。
A heavy-fermion superconductoris a unique spin-triplet superconductor with multiple superconducting phases. Here, we provide the first report on a first-principles analysis of the microscopic superconducting gap structure. We find that the promising gap structure is an unprecedentedstate, which is completely different from the previous phenomenologicalmodels. Our obtainedstate 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 spinrepresentation, but is described by the group-theoretical representation of the Cooper pairs in the total angular momentumspace. Our findings shed new light on the long-standing problems in the superconductivity of.