Evidence for multiband gapless superconductivity in the topological superconductor candidate 4Hb-TaS2
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866915058959777792 |
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| author | Wang, Hanru Jiao, Yihan Meng, Fanyu Zhang, Xu Dai, Dongzhe Tu, Chengpeng Zhao, Chengcheng Xin, Lu Huang, Sicheng Lei, Hechang Li, Shiyan |
| author_facet | Wang, Hanru Jiao, Yihan Meng, Fanyu Zhang, Xu Dai, Dongzhe Tu, Chengpeng Zhao, Chengcheng Xin, Lu Huang, Sicheng Lei, Hechang Li, Shiyan |
| contents | 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 $κ_{0}/T$ is observed, indicating the existence of a residual density of states in the superconducting state. The slow field dependence of $κ_{0}/T$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_08450 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evidence for multiband gapless superconductivity in the topological superconductor candidate 4Hb-TaS2 Wang, Hanru Jiao, Yihan Meng, Fanyu Zhang, Xu Dai, Dongzhe Tu, Chengpeng Zhao, Chengcheng Xin, Lu Huang, Sicheng Lei, Hechang Li, Shiyan Superconductivity Materials Science Strongly Correlated Electrons 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 $κ_{0}/T$ is observed, indicating the existence of a residual density of states in the superconducting state. The slow field dependence of $κ_{0}/T$ 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. |
| title | Evidence for multiband gapless superconductivity in the topological superconductor candidate 4Hb-TaS2 |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.08450 |