论文标题
Spin-3/2拓扑半学YPTBI中的异常量子振荡
Anomalous Quantum Oscillations in Spin-3/2 Topological Semimetal YPtBi
论文作者
论文摘要
拟议的半高旋转器中提出的高自旋超导化合物会改变超导性研究的景观。虽然只有在具有量子机械相干的准粒子的系统中，超导不稳定才有可能，但尚未针对任何提议的高旋转费米表面进行验证。在这里，我们报告了半身YPTBI中异常的Shubnikov-de Haas效应的观察，这与连贯的$ j = 3/2 $ fermi表面兼容。立方YPTBI中的量子振荡（QO）信号在磁场从[100]到[110]晶体学方向旋转后表现出极端各向异性，在这些方向上，QO信号在[110]附近急剧消失。这种用于立方系统的自由基各向异性无法通过涉及有效质量或杂质散射的QO的微不足道来解释，但是自然而然地通过$ j = 3/2 $ fermi表面YPTBI的翘曲特征来解释。我们的结果证明了半手化合物中准粒子的高旋转性质，这使得实现前所未有的高自旋超导性更加合理。
The proposed high-spin superconductivity in the half-Heusler compounds changes the landscape of superconductivity research. While superconducting instability is possible only in systems with quantum mechanically coherent quasiparticles, it has not been verified for any proposed high-spin Fermi surfaces. Here we report an observation of anomalous Shubnikov-de Haas effect in half-Heusler YPtBi, which is compatible with a coherent $j=3/2$ Fermi surface. The quantum oscillation (QO) signal in cubic YPtBi manifests extreme anisotropy upon rotation of the magnetic field from [100] to [110] crystallographic direction where the QO signal drastically vanishes near [110]. This radical anisotropy for a cubic system cannot be explained by trivial scenarios for QO involving effective mass or impurity scattering, but it is naturally explained by the warping feature of the $j=3/2$ Fermi surface YPtBi. Our results prove the high-spin nature of the quasiparticle in the half-Heusler compounds, which makes the realization of the unprecedented high-spin superconductivity more plausible.
