| Autor: |
Zhao, Chengcheng, Liu, Xiangqi, Wang, Jinjin, Xu, Chunqiang, Wang, Baomin, Xia, Wei, Yu, Zhenhai, Jin, Xiaobo, Zhang, Xu, Wang, Jing, Dai, Dongzhe, Tu, Chengpeng, Nie, Jiaying, Wang, Hanru, Jiao, Yihan, Duong, Daniel, Huang, Silu, Jin, Rongying, Xu, Zhu'an, Guo, Yanfeng, Xu, Xiaofeng, Li, Shiyan |
| Rok vydání: |
2023 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
Recently PdTe was identified as a spin-orbit coupled topological Dirac semimetal and was claimed to exhibit both bulk-nodal and surface-nodeless superconducting gaps. Here we report the ultralow-temperature thermal conductivity measurements on PdTe single crystals with $T_c$ = 4.5 K to investigate its superconducting gap structure. It is found that the residual linear term $\kappa_0/T$ is negligible in zero magnetic field. Furthermore, the field dependence of $\kappa_0(H)/T$ exhibits an $\sf S$-shaped curve. These results suggest that PdTe has multiple nodeless superconducting gaps, which is at odds with the claimed bulk-nodal gap. The reason for the discrepancy is likely that previous angle-resolved photoemission spectroscopy measurements were only performed down to 2 K and cannot observe the smaller nodeless gap. The fully gapped superconducting state in PdTe is compatible with it being a topological superconductor candidate. |
| Databáze: |
arXiv |
| Externí odkaz: |
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