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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2509.15288 |
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| _version_ | 1866914046872125440 |
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| author | Zhao, Yu-qing Wu, Zhi-fan Zuo, Hai-yan Lao, Wei-ming He, Yao Wang, Hai Zhao, Ling-xiao Sun, Ying-hui Yang, Huai-xin Chen, Geng-fu Ren, Cong |
| author_facet | Zhao, Yu-qing Wu, Zhi-fan Zuo, Hai-yan Lao, Wei-ming He, Yao Wang, Hai Zhao, Ling-xiao Sun, Ying-hui Yang, Huai-xin Chen, Geng-fu Ren, Cong |
| contents | Noncentrosymmetric superconductor PbTaSe$_2$, hosting bulk nodal-line fermions (Phys. Rev. B. 89, 020505) and spin-helical surface states (Nature Communication 7, 10556), represents a prime candidate for realizing topological superconductivity and Majorana bound states (MBS). However, the definitive experimental signature of MBS in this system has thus far remained elusive. Here we provide a comprehensive investigation of its superconducting properties under hydrostatic pressure. Combining Andreev reflection spectroscopy and temperature-dependent resistance measurements, we identify a separated surface-like superconductivity from the bulk one at a critical pressure $P_c$. The superconducting surface state demonstrate an $s$-wave pairing state with a strong coupling strength. Under magnetic fields, the absence of zero-bias conductance peak in the pressurized point-contact Andreev reflection spectrum. Our findings imposes a constraint on the theoretical proposals for realizing Majorana bound states in noncentrosymmetric superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_15288 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Absence of Andreev Bound States in Noncentrosymmetric Superconductor PbTaSe$_2$ under Hydrostatic Pressures Zhao, Yu-qing Wu, Zhi-fan Zuo, Hai-yan Lao, Wei-ming He, Yao Wang, Hai Zhao, Ling-xiao Sun, Ying-hui Yang, Huai-xin Chen, Geng-fu Ren, Cong Superconductivity Noncentrosymmetric superconductor PbTaSe$_2$, hosting bulk nodal-line fermions (Phys. Rev. B. 89, 020505) and spin-helical surface states (Nature Communication 7, 10556), represents a prime candidate for realizing topological superconductivity and Majorana bound states (MBS). However, the definitive experimental signature of MBS in this system has thus far remained elusive. Here we provide a comprehensive investigation of its superconducting properties under hydrostatic pressure. Combining Andreev reflection spectroscopy and temperature-dependent resistance measurements, we identify a separated surface-like superconductivity from the bulk one at a critical pressure $P_c$. The superconducting surface state demonstrate an $s$-wave pairing state with a strong coupling strength. Under magnetic fields, the absence of zero-bias conductance peak in the pressurized point-contact Andreev reflection spectrum. Our findings imposes a constraint on the theoretical proposals for realizing Majorana bound states in noncentrosymmetric superconductors. |
| title | Absence of Andreev Bound States in Noncentrosymmetric Superconductor PbTaSe$_2$ under Hydrostatic Pressures |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2509.15288 |