Pressure-induced superconductivity in topological semimetal NbAs2

Pressure-induced superconductivity in topological semimetal NbAs2
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拓扑半金属 NbAs2 中的压力诱导超导

DOI:
10.1038/s41535-018-0132-1
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发表时间:
2018-11
影响因子:
5.7
通讯作者:
Xu Zhu-An
Xu Zhu-An
中科院分区:
材料科学2区
文献类型:
--
作者:
Li Yupeng;An Chao;Hua Chenqiang;Chen Xuliang;Zhou Yonghui;Zhou Ying;Zhang Ranran;Park Changyong;Wang Zhen;Lu Yunhao;Zheng Yi;Yang Zhaorong;Xu Zhu-An

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具有马约拉纳束缚态的拓扑超导是实现非阿贝尔量子计算的关键,在具有非平凡拓扑特征的三维半金属中,当超导跃迁发生时,可以实现具有马约拉纳束缚态的拓扑超导。在这里,我们报道了过渡金属双镍态NbAs2的压力诱导超导性。在最大实验压力为29.8 GPa之前,超导性的出现没有伴随任何结构相变,这得到了压力相关同步加速器x射线衍射和拉曼光谱的支持。有趣的是,拉曼研究揭示了声子模式在10 GPa以上的快速硬化和展宽,与超导转变相一致。利用第一性原理计算,我们确定了压力引起的费米表面变化,这种变化在不破坏电子-空穴补偿的情况下稳定地增加了态密度。值得注意的是,nbas2的主孔袋包含了单斜晶格的一个时间逆不变动量,这表明nbas2是拓扑超导体的候选者。
Topological superconductivity with Majorana bound states, which are critical to implement nonabelian quantum computation, may be realized in three-dimensional semimetals with nontrivial topological feature, when superconducting transition occurs in the bulk. Here, we report pressure-induced superconductivity in a transition-metal dipnictide NbAs2. The emergence of superconductivity is not accompanied by any structural phase transition up to the maximum experimental pressure of 29.8 GPa, as supported by pressure-dependent synchrotron X-ray diffraction and Raman spectroscopy. Intriguingly, the Raman study reveals rapid phonon mode hardening and broadening above 10 GPa, in coincident with the superconducting transition. Using first-principle calculations, we determine Fermi surface change induced by pressure, which steadily increases the density of states without breaking the electron–hole compensation. Noticeably, the main hole pocket of NbAs2encloses one time-reversal-invariant momenta of the monoclinic lattice, suggesting NbAs2as a candidate of topological superconductors.
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