Magneto-Tunable Thermal Diode Based on Bulk Superconductor
Abstract
Thermal diode is a growing technology and important for active thermal flow control. Since the theoretical designing of thermal diode in 2004, various kinds of solid-state thermal diodes have been theoretically and experimentally investigated. Here, we report on the observation of thermal rectification in bulk-size superconductor-normal metal junctions. High-purity (5N) wires of Pb and Al are soldered, and thermal conductivity (appa) of the junctions is measured in two different directions of the heat flow, forward (appaF) and reverse (appaR) directions. Thermal rectification ratio (appaF / appaR) of 1.75 is obtained at T ~ 5.2 K with H = 400 Oe. The merit of the Pb-Al junction is a large difference of appa in an order of several hundred W m-1 K-1 and magneto-tunability of the working temperature.
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