Nonreciprocal Transport in chiral Mo3Al2C Near the Superconducting to Normal Transition
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908713201172480 |
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| author | Park, Jeongsoo Cheong, Sang-Wook Xu, Xianghan |
| author_facet | Park, Jeongsoo Cheong, Sang-Wook Xu, Xianghan |
| contents | We investigate nonreciprocal electrical transport in bulk single-crystalline Mo3Al2C, a material known to host crystallographic chirality, a polar charge-density-wave instability, and a superconducting transition near 8 K. Using AC transport measurements to analyze the first-harmonic and second-harmonic resistance responses, we observe a distinct nonreciprocal second-harmonic signal that is significantly enhanced near the boundary of the normal and superconducting phases. Phenomenologically, this response arises from direction-dependent coupling between the external magnetic field and the current-induced intrinsic magnetization within the chiral lattice. Furthermore, a persistent nonreciprocal response observed under perpendicular magnetic fields suggests a toroidal-induced effect linked to the electric polarization emerging from the charge-density-wave phase. These results demonstrate that bulk Mo3Al2C serves as an intrinsic platform for tunable nonreciprocal transport rooted in the interplay of chirality, polarity, and superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_13601 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nonreciprocal Transport in chiral Mo3Al2C Near the Superconducting to Normal Transition Park, Jeongsoo Cheong, Sang-Wook Xu, Xianghan Superconductivity We investigate nonreciprocal electrical transport in bulk single-crystalline Mo3Al2C, a material known to host crystallographic chirality, a polar charge-density-wave instability, and a superconducting transition near 8 K. Using AC transport measurements to analyze the first-harmonic and second-harmonic resistance responses, we observe a distinct nonreciprocal second-harmonic signal that is significantly enhanced near the boundary of the normal and superconducting phases. Phenomenologically, this response arises from direction-dependent coupling between the external magnetic field and the current-induced intrinsic magnetization within the chiral lattice. Furthermore, a persistent nonreciprocal response observed under perpendicular magnetic fields suggests a toroidal-induced effect linked to the electric polarization emerging from the charge-density-wave phase. These results demonstrate that bulk Mo3Al2C serves as an intrinsic platform for tunable nonreciprocal transport rooted in the interplay of chirality, polarity, and superconductivity. |
| title | Nonreciprocal Transport in chiral Mo3Al2C Near the Superconducting to Normal Transition |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2512.13601 |