Hyeok Yoon, Yun Suk Eo, Jihun Park, Jarryd A. Horn, Ryan G. Dorman, Shanta R. Saha, Ian M. Hayes, Ichiro Takeuchi, Philip M. R. Brydon, Johnpierre Paglione
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引用次数: 0
摘要
迄今为止，二碲化铀（UTe2）是块状 p 波超导体的最有力竞争者。在此，我们对 UTe2 的常压超导相进行了光谱研究，测量了由不同晶面上的金属触点形成的点接触结在低至 250 mK 和高至 18 T 下的电导率。利用布隆德-廷卡姆-克拉普韦克（BTK）p 波配对模型拟合一系列定性变化的光谱，我们可以提取每个结的间隙振幅和界面势垒强度。我们发现，数据与振幅为 0.26 ± 0.06 meV 的主要 p 波间隙函数非常吻合。我们的工作提供了光谱学证据，证明UTe2 超导态中的间隙结构与所提出的自旋-三重配对相一致。
Probing p-wave superconductivity in UTe2 via point-contact junctions
Uranium ditelluride (UTe2) is the strongest contender to date for a p-wave superconductor in bulk form. Here we perform a spectroscopic study of the ambient pressure superconducting phase of UTe2, measuring conductance through point-contact junctions formed by metallic contacts on different crystalline facets down to 250 mK and up to 18 T. Fitting a range of qualitatively varying spectra with a Blonder-Tinkham-Klapwijk (BTK) model for p-wave pairing, we can extract gap amplitude and interface barrier strength for each junction. We find good agreement with the data for a dominant py-wave gap function with amplitude 0.26 ± 0.06 meV. Our work provides spectroscopic evidence for a gap structure consistent with the proposed spin-triplet pairing in the superconducting state of UTe2.
期刊介绍：
npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.
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