Huge anisotropic magneto-thermal switching in high-purity polycrystalline compensated metals
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866913868758908928 |
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| author | Rani, Poonam Watanabe, Yuto Shiga, Takuma Sakuraba, Yuya Takeda, Hikaru Yamashita, Minoru Uchida, Ken-ichi Yamashita, Aichi Mizuguchi, Yoshikazu |
| author_facet | Rani, Poonam Watanabe, Yuto Shiga, Takuma Sakuraba, Yuya Takeda, Hikaru Yamashita, Minoru Uchida, Ken-ichi Yamashita, Aichi Mizuguchi, Yoshikazu |
| contents | Magneto-thermal transport is a promising physical property for thermal management applications. Magneto-thermal switching enables active control of heat flows, and a high switching ratio is desirable for improving performance. Here, we report on the observation of a huge magneto-thermal switching (MTS) effect in high-purity (5N) Pb polycrystalline wires, where magnetic fields perpendicular to the heat current direction are applied at low temperatures. At T = 3 K and B = 0.1 T, the measured thermal conductivity (\k{appa}) of the Pb wire is about 2500 W m-1 K-1 but is reduced to ~150 and ~5 W m-1 K-1 at B = 1 and 9 T, respectively. This strong suppression is attributed to magnetoresistance in compensated metals. Although the huge magnetoresistance has been studied in single crystals with field along the selected orbitals, our results demonstrate that a huge MTS can similarly be realized even in flexible polycrystalline wires. This finding highlights the practical potential of magneto-thermal control in low-temperature thermal management, including applications in space environments where temperatures are around 3 K. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_00427 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Huge anisotropic magneto-thermal switching in high-purity polycrystalline compensated metals Rani, Poonam Watanabe, Yuto Shiga, Takuma Sakuraba, Yuya Takeda, Hikaru Yamashita, Minoru Uchida, Ken-ichi Yamashita, Aichi Mizuguchi, Yoshikazu Materials Science Magneto-thermal transport is a promising physical property for thermal management applications. Magneto-thermal switching enables active control of heat flows, and a high switching ratio is desirable for improving performance. Here, we report on the observation of a huge magneto-thermal switching (MTS) effect in high-purity (5N) Pb polycrystalline wires, where magnetic fields perpendicular to the heat current direction are applied at low temperatures. At T = 3 K and B = 0.1 T, the measured thermal conductivity (\k{appa}) of the Pb wire is about 2500 W m-1 K-1 but is reduced to ~150 and ~5 W m-1 K-1 at B = 1 and 9 T, respectively. This strong suppression is attributed to magnetoresistance in compensated metals. Although the huge magnetoresistance has been studied in single crystals with field along the selected orbitals, our results demonstrate that a huge MTS can similarly be realized even in flexible polycrystalline wires. This finding highlights the practical potential of magneto-thermal control in low-temperature thermal management, including applications in space environments where temperatures are around 3 K. |
| title | Huge anisotropic magneto-thermal switching in high-purity polycrystalline compensated metals |
| topic | Materials Science |
| url | https://arxiv.org/abs/2506.00427 |