Strong superconducting pairing strength and pseudogap features in a putative multiphase heavy-fermion superconductor CeRh2As2 by soft point-contact spectroscopy
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Dong, Qingxin Shi, Tong Yang, Pengtao Liu, Xinyang Shi, Xiaofan Wang, Lei Xiang, Junsen Ma, Hanming Tian, Zhaoming Sun, Jianping Uwatoko, Yoshiya Chen, Genfu Wang, Xinbo Shen, Jie Wu, Rui Lu, Xin Sun, Peijie Chajewski, Grzegorz Kaczorowski, Dariusz Wang, Bosen Cheng, Jinguang |
| author_facet | Dong, Qingxin Shi, Tong Yang, Pengtao Liu, Xinyang Shi, Xiaofan Wang, Lei Xiang, Junsen Ma, Hanming Tian, Zhaoming Sun, Jianping Uwatoko, Yoshiya Chen, Genfu Wang, Xinbo Shen, Jie Wu, Rui Lu, Xin Sun, Peijie Chajewski, Grzegorz Kaczorowski, Dariusz Wang, Bosen Cheng, Jinguang |
| contents | CeRh2As2 is a newly discovered candidate of multiphase heavy-fermion superconductor (Tc=0.3 K) with intriguing physical properties. Here, we employ soft point-contact spectroscopy to investigate its energy gap behaviors in both the normal and superconducting states. The differential conductance below Tc reveals an estimated superconducting energy gap of 2ΔSC=0.24 meV and thus an extremely strong superconducting pairing strength 2ΔSC/kBTc=8.8, which is comparable to those of cuprates and iron-based high-Tc superconductors as well as infinite-layer nickelates. Above Tc, a well-defined pseudogap feature is manifested as a V-shaped dip in the differential conductance spanning an energy scale of 2Δg=0.95-3.0 meV. The pseudogap feature persists to the highest characteristic temperature of Tg=8-9 K and is gradually suppressed by magnetic field of Bg=9.0T regardless of its direction relative to the crystallographic axes. The observation of pseudogap features prior to the superconducting phase transition enriches the phase diagram of CeRh2As2 and provides a novel platform to study the interplay of unconventional superconductivity and pseudogap phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_02231 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Strong superconducting pairing strength and pseudogap features in a putative multiphase heavy-fermion superconductor CeRh2As2 by soft point-contact spectroscopy Dong, Qingxin Shi, Tong Yang, Pengtao Liu, Xinyang Shi, Xiaofan Wang, Lei Xiang, Junsen Ma, Hanming Tian, Zhaoming Sun, Jianping Uwatoko, Yoshiya Chen, Genfu Wang, Xinbo Shen, Jie Wu, Rui Lu, Xin Sun, Peijie Chajewski, Grzegorz Kaczorowski, Dariusz Wang, Bosen Cheng, Jinguang Superconductivity Strongly Correlated Electrons CeRh2As2 is a newly discovered candidate of multiphase heavy-fermion superconductor (Tc=0.3 K) with intriguing physical properties. Here, we employ soft point-contact spectroscopy to investigate its energy gap behaviors in both the normal and superconducting states. The differential conductance below Tc reveals an estimated superconducting energy gap of 2ΔSC=0.24 meV and thus an extremely strong superconducting pairing strength 2ΔSC/kBTc=8.8, which is comparable to those of cuprates and iron-based high-Tc superconductors as well as infinite-layer nickelates. Above Tc, a well-defined pseudogap feature is manifested as a V-shaped dip in the differential conductance spanning an energy scale of 2Δg=0.95-3.0 meV. The pseudogap feature persists to the highest characteristic temperature of Tg=8-9 K and is gradually suppressed by magnetic field of Bg=9.0T regardless of its direction relative to the crystallographic axes. The observation of pseudogap features prior to the superconducting phase transition enriches the phase diagram of CeRh2As2 and provides a novel platform to study the interplay of unconventional superconductivity and pseudogap phenomena. |
| title | Strong superconducting pairing strength and pseudogap features in a putative multiphase heavy-fermion superconductor CeRh2As2 by soft point-contact spectroscopy |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2501.02231 |