Enhanced electron heat conduction in tas3 1d metal wire

Abstract

© 2021 by the authors. Licensee MDPI, Basel, Switzerland.The 1D wire TaS3 exhibits metallic behavior at room temperature but changes into a semiconductor below the Peierls transition temperature (Tp), near 210 K. Using the 3! method, we measured the thermal conductivity k of TaS3 as a function of temperature. Electrons dominate the heat conduction of a metal. The Wiedemann–Franz law states that the thermal conductivity k of a metal is proportional to the electrical conductivity σ with a proportional coefficient of L0, known as the Lorenz number—that is, k = sL0T. Our characterization of the thermal conductivity of metallic TaS3 reveals that, at a given temperature T, the thermal conductivity σ is much higher than the value estimated in the Wiedemann–Franz (W-F) law. The thermal conductivity of metallic TaS3 was approximately 12 times larger than predicted by W-F law, implying L = 12L0. This result implies the possibility of an existing heat conduction path that the Sommerfeld theory cannot account for.