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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2512.03742 |
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| _version_ | 1866918229794881536 |
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| author | Liu, Qi-Yuan Shi, Chenfei Lin, Zhaodi Deng, Xiutong Kang, Baojuan Shi, Youguo Wang, Gang Jia, Rongrong Bao, Jin-Ke |
| author_facet | Liu, Qi-Yuan Shi, Chenfei Lin, Zhaodi Deng, Xiutong Kang, Baojuan Shi, Youguo Wang, Gang Jia, Rongrong Bao, Jin-Ke |
| contents | Quasi-one-dimensional materials $A$Mn$_6$Bi$_5$ ($A$ = Na, K, Rb, Cs) exhibit unique electronic behaviors such as antiferromagnetism, charge density waves, and pressure-induced superconductivity. Thus, they serve as a suitable model system to investigate emergent quantum phenomena produced by the interactions among spin, charge, and lattice. Here we report the magnetotransport properties of KMn$_6$Bi$_5$, revealing a cascade of temperature-dependent carrier dynamics. Below 5 K, the system, despite its anisotropic electronic structure, could be effectively described by an isotropic two-band model and exhibits a large, non-saturating magnetoresistance ($\propto B^{1.8}$). Upon warming, a crossover to a single-band regime occurs around 20 K, driven by the suppression of a hole pocket. Electron density recovers as antiferromagnetic gap openings gradually close from 25 to 70 K which is just below the N$\mathrm{\acute{e}}$el temperature. Within this temperature range, field-quenched spin fluctuations suppress magnetoresistance. Furthermore, we attribute the low-temperature resistivity upturn to the scaling behavior of magnetoresistance. These findings provide crucial insights into the interplay of dimensionality, magnetism, and electron correlations in quasi-one-dimensional magnetic semimetals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_03742 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetotransport and Carrier Dynamics in Quasi-One-Dimensional Antiferromagnet KMn$_6$Bi$_5$ Liu, Qi-Yuan Shi, Chenfei Lin, Zhaodi Deng, Xiutong Kang, Baojuan Shi, Youguo Wang, Gang Jia, Rongrong Bao, Jin-Ke Superconductivity Strongly Correlated Electrons Quasi-one-dimensional materials $A$Mn$_6$Bi$_5$ ($A$ = Na, K, Rb, Cs) exhibit unique electronic behaviors such as antiferromagnetism, charge density waves, and pressure-induced superconductivity. Thus, they serve as a suitable model system to investigate emergent quantum phenomena produced by the interactions among spin, charge, and lattice. Here we report the magnetotransport properties of KMn$_6$Bi$_5$, revealing a cascade of temperature-dependent carrier dynamics. Below 5 K, the system, despite its anisotropic electronic structure, could be effectively described by an isotropic two-band model and exhibits a large, non-saturating magnetoresistance ($\propto B^{1.8}$). Upon warming, a crossover to a single-band regime occurs around 20 K, driven by the suppression of a hole pocket. Electron density recovers as antiferromagnetic gap openings gradually close from 25 to 70 K which is just below the N$\mathrm{\acute{e}}$el temperature. Within this temperature range, field-quenched spin fluctuations suppress magnetoresistance. Furthermore, we attribute the low-temperature resistivity upturn to the scaling behavior of magnetoresistance. These findings provide crucial insights into the interplay of dimensionality, magnetism, and electron correlations in quasi-one-dimensional magnetic semimetals. |
| title | Magnetotransport and Carrier Dynamics in Quasi-One-Dimensional Antiferromagnet KMn$_6$Bi$_5$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.03742 |