Thermal rectification in jointless Pb solid wire

Masayuki Mashiko; Poonam Rani; Yuto Watanabe; Yoshikazu Mizuguchi

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arXiv · 2509.14631

Thermal rectification in jointless Pb solid wire

Masayuki Mashiko·Poonam Rani·Yuto Watanabe·Yoshikazu Mizuguchi

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Abstract

Thermal rectification is observed in jointless Pb wires at temperatures near the superconducting transition of Pb under magnetic fields. Using different magnetic-field (H) response of temperature dependence of thermal conductivity (\k{appa}-T) under H parallel to J and H perpendicular to J where J is heat flow, we fabricated a jointless thermal diode. Thermal rectification is observed with the thermal rectification ratio (TRR) of 1.5 and the difference in \k{appa} of 330 W m-1 K-1 at T = 5.11 K under H = 400 Oe for a Pb wire with a 50%-bent (H perpendicular to J) and 50%-straight (H parallel to J) structure. The peak temperature of TRR can be tuned by the strength of applied magnetic field. By changing bent ratio to 40%-bent, a higher TRR exceeding 2 was observed. The Pb-jointless thermal diode will be a useful material for thermal management at cryogenic temperatures.

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Masayuki Mashiko, Poonam Rani, Yuto Watanabe, Yoshikazu Mizuguchi. 2025-09-18. Thermal rectification in jointless Pb solid wire. https://arxiv.org/abs/2509.14631

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