Evidence for multiband gapless superconductivity in the topological superconductor candidate 4Hb-TaS2
| Autor: | Wang, Hanru, Jiao, Yihan, Meng, Fanyu, Zhang, Xu, Dai, Dongzhe, Tu, Chengpeng, Zhao, Chengcheng, Xin, Lu, Huang, Sicheng, Lei, Hechang, Li, Shiyan |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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. Comment: 8 pages, 4 figures |
| Databáze: | arXiv |
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