Pressure-induced superconductivity in topological semimetal NbAs2

Abstract

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 NbAs2 encloses one time-reversal-invariant momenta of the monoclinic lattice, suggesting NbAs2 as a candidate of topological superconductors.

8 pages, 4 figures

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• High-Pressure Crystal Growth, Superconducting Properties, and Electronic Band Structure of Nb2P5
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• Intrinsic superconducting diode effects in tilted Weyl and Dirac semimetals
• Termination Dependent Topological Surface States in Nodal Loop Semimetal HfP2
• Pressure effect on the topologically nontrivial electronic state and transport of lutecium monobismuthide
• Robust magnetoresistance in TaAs2 under pressure up to about 37 GPa
• Topological Transitions in a Model for Proximity Induced Superconductivity
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• Ta2Pd3Te5 topological thermometer
• Pressure induced electronic band evolution and observation of superconductivity in the Dirac semimetal ZrTe5