Multiband superconductivity in the topological Kramers nodal-line semimetals
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909651700809728 |
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| author | Shang, Tian Zhao, Jianzhou Xia, Keqi Hu, Lun-Hui Xu, Yang Zhan, Qingfeng Gawryluk, Dariusz Jakub Shiroka, Toni |
| author_facet | Shang, Tian Zhao, Jianzhou Xia, Keqi Hu, Lun-Hui Xu, Yang Zhan, Qingfeng Gawryluk, Dariusz Jakub Shiroka, Toni |
| contents | Recent band-structure calculations predict that the ruthenium-based ternary silicides are three-dimensional Kramers nodal line semimetals. Among them, NbRuSi and TaRuSi show bulk superconductivity (SC) below $T_c \sim 3$ K and 4 K, as well as spontaneous magnetic fields. The latter indicates the breaking of time-reversal symmetry and, thus, unconventional SC in both compounds. Previous temperature-dependent muon-spin spectroscopy studies failed to distinguish whether such compounds exhibit single-gap or multi-gap SC. Here, we report on systematic measurements of the field-dependent muon-spin relaxation rates in the superconducting state and on temperature-dependent electrical resistivity and specific heat under applied magnetic fields. Both the upper critical field and the field-dependent superconducting relaxation are well described by a two-band model. By combining our experimental results with numerical band-structure calculations, we provide solid evidence for multiband SC in NbRuSi and TaRuSi, and thus offer further insight into the unconventional- and topological nature of their superconductivity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_03509 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multiband superconductivity in the topological Kramers nodal-line semimetals Shang, Tian Zhao, Jianzhou Xia, Keqi Hu, Lun-Hui Xu, Yang Zhan, Qingfeng Gawryluk, Dariusz Jakub Shiroka, Toni Superconductivity Strongly Correlated Electrons Recent band-structure calculations predict that the ruthenium-based ternary silicides are three-dimensional Kramers nodal line semimetals. Among them, NbRuSi and TaRuSi show bulk superconductivity (SC) below $T_c \sim 3$ K and 4 K, as well as spontaneous magnetic fields. The latter indicates the breaking of time-reversal symmetry and, thus, unconventional SC in both compounds. Previous temperature-dependent muon-spin spectroscopy studies failed to distinguish whether such compounds exhibit single-gap or multi-gap SC. Here, we report on systematic measurements of the field-dependent muon-spin relaxation rates in the superconducting state and on temperature-dependent electrical resistivity and specific heat under applied magnetic fields. Both the upper critical field and the field-dependent superconducting relaxation are well described by a two-band model. By combining our experimental results with numerical band-structure calculations, we provide solid evidence for multiband SC in NbRuSi and TaRuSi, and thus offer further insight into the unconventional- and topological nature of their superconductivity. |
| title | Multiband superconductivity in the topological Kramers nodal-line semimetals |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2506.03509 |