Nodeless superconductivity in 4H$_{b}$-TaS$_{2}$ with broken time reversal symmetry
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866918105212518400 |
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| author | Zhou, Yuwei Meng, Fanyu Huang, Yanen Zhang, Jiawen Zhan, Jin Chen, Ye Liu, Yu Lei, Hechang Smidman, Michael Yuan, Huiqiu |
| author_facet | Zhou, Yuwei Meng, Fanyu Huang, Yanen Zhang, Jiawen Zhan, Jin Chen, Ye Liu, Yu Lei, Hechang Smidman, Michael Yuan, Huiqiu |
| contents | The transition metal dichalcogenide 4H$_{b}$-TaS$_{2}$ exhibits characteristics of topological edge modes and two-component superconductivity with time-reversal symmetry breaking (TRSB). The nature of the superconducting order parameter is a crucial issue that requires experimental investigation. Here, we report measurements of the magnetic penetration depth using a tunnel-diode-oscillator based technique, as well as the specific heat. Both the specific heat and the change in magnetic penetration depth ($Δ$$λ$(T)) display an exponentially-activated temperature dependence, providing evidence for nodeless superconductivity in 4H$_{b}$-TaS$_{2}$. Moreover, the deduced superfluid density can be well described by a two-gap $s$-wave model, and such multigap superconductivity is consistent with there being multiple bands crossing the Fermi energy. These results constrain the possible pairing symmetries of 4H$_{b}$-TaS$_{2}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_07584 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nodeless superconductivity in 4H$_{b}$-TaS$_{2}$ with broken time reversal symmetry Zhou, Yuwei Meng, Fanyu Huang, Yanen Zhang, Jiawen Zhan, Jin Chen, Ye Liu, Yu Lei, Hechang Smidman, Michael Yuan, Huiqiu Superconductivity The transition metal dichalcogenide 4H$_{b}$-TaS$_{2}$ exhibits characteristics of topological edge modes and two-component superconductivity with time-reversal symmetry breaking (TRSB). The nature of the superconducting order parameter is a crucial issue that requires experimental investigation. Here, we report measurements of the magnetic penetration depth using a tunnel-diode-oscillator based technique, as well as the specific heat. Both the specific heat and the change in magnetic penetration depth ($Δ$$λ$(T)) display an exponentially-activated temperature dependence, providing evidence for nodeless superconductivity in 4H$_{b}$-TaS$_{2}$. Moreover, the deduced superfluid density can be well described by a two-gap $s$-wave model, and such multigap superconductivity is consistent with there being multiple bands crossing the Fermi energy. These results constrain the possible pairing symmetries of 4H$_{b}$-TaS$_{2}$. |
| title | Nodeless superconductivity in 4H$_{b}$-TaS$_{2}$ with broken time reversal symmetry |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2507.07584 |