标题： 4Hb-TaS2拓扑超导体候选物中的多带无能隙超导证据 显示英文标题

标题： Evidence for multiband gapless superconductivity in the topological superconductor candidate 4Hb-TaS2

摘要： 我们对过渡金属二硫属化物材料4Hb-TaS$_{2}$的单晶进行了超低温热导率测量，该材料最近被提出作为拓扑超导体的候选材料。 在零磁场下，观察到一个微小的剩余线性项$\kappa_{0}/T$，表明超导态中存在剩余态密度。 在低磁场下$\kappa_{0}/T$的缓慢磁场依赖性排除了超导能隙中存在节点的可能，而整个磁场范围内的S形磁场依赖性表明4Hb-TaS$_{2}$中存在多个超导能隙。 我们的结果为4Hb-TaS$_{2}$中的多带无能隙超导性提供了证据，剩余态密度来源于某些无能隙的费米面。 显示英文摘要

摘要： We present the ultralow-temperature thermal conductivity measurements on single crystals of transition-metal dichalcogenide material 4Hb-TaS$_{2}$, which has recently been proposed as a topological superconductor candidate. In zero field, a small residual linear term $\kappa_{0}/T$ is observed, indicating the existence of a residual density of states in the superconducting state. The slow field dependence of $\kappa_{0}/T$ at low fields rules out the presence of nodes in the superconducting gap, and the S-shaped field dependence across the full field range suggests multiple superconducting gaps in 4Hb-TaS$_{2}$. Our results provide evidence for multiband gapless superconductivity in 4Hb-TaS$_{2}$, and the residual density of states come from certain gapless Fermi surfaces.