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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 (5 N) 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 (κ) 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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: thermal transport, magneto-thermal switching, compensated metal

Date published: 2025-07-15

Publisher: Elsevier BV

Journal:

• Materials Today Electronics (ISSN: 27729494) vol. 13 100165

Funding:

• 東京都立大学
• Japan Science and Technology Agency Strategic Basic Research Programs JPMJER2201

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5636

First published URL: https://doi.org/10.1016/j.mtelec.2025.100165

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Updated at: 2025-08-19 08:30:14 +0900

Published on MDR: 2025-08-19 08:20:10 +0900