Abstract
We performed angle-resolved photoemission spectroscopy with microfocused beam on a topological line-nodal compound which undergoes a superconducting transition at the onset 1.8 K, to clarify the Fermi-surface topology relevant to the occurrence of superconductivity. We found that a three-dimensional hole pocket at the point is commonly seen for two types of single-crystalline samples fabricated by different growth conditions. On the other hand, the carrier-doping level estimated from the position of the chemical potential was found to be sensitive to the sample fabrication condition. The cylindrical electron pocket at the point predicted by the calculations is absent in one of the two samples, despite the fact that both samples commonly show superconductivity with similar 's. This suggests a key role of the three-dimensional hole pocket to the occurrence of superconductivity, and further points to an intriguing possibility to control the topological nature of superconductivity by carrier tuning in .
- Received 13 July 2022
- Revised 5 October 2022
- Accepted 10 October 2022
DOI:https://doi.org/10.1103/PhysRevMaterials.6.104203
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