论文标题
Mott spin液体候选naybse $ _2 $中的莫特过渡和超导率
Mott Transition and Superconductivity in Quantum Spin Liquid Candidate NaYbSe$_2$
论文作者
论文摘要
莫特（Mott）过渡是凝结物理学的基本问题之一，尤其是在具有反铁磁长期顺序的系统中。但是，没有远距离顺序的量子自旋液体（QSL）系统中的莫特过渡很少见。在这里，我们报告了对金属过渡的压力诱导的绝缘子的观察，然后在QSL候选naybse2中出现超导性，其三角形晶格为4f yb $ _3^+$ ions。金属状态运输特性的详细分析显示，接近超导性附近时，从非弗米液体到费米液体行为的演变。 X射线衍射揭示了不可逆的结构相变。这些结果阐明了QSL系统中Mott的过渡和超导性。
The Mott transition is one of the fundamental issues in condensed matter physics, especially in the system with antiferromagnetic long-range order. However the Mott transition in quantum spin liquid (QSL) systems without long-range order is rare. Here we report the observation of the pressure-induced insulator to metal transition followed by the emergence of superconductivity in the QSL candidate NaYbSe2 with triangular lattice of 4f Yb$_3^+$ ions. Detail analysis of transport properties at metallic state shows an evolution from non-Fermi liquid to Fermi liquid behavior when approaching the vicinity of superconductivity. An irreversible structure phase transition occurs around 11 GPa is revealed by the X-ray diffraction. These results shed light on the Mott transition and superconductivity in the QSL systems.
