Enhanced Electron Heat Conduction in TaS3 1D Metal Wire.

Hojoon Yi,Sehwan Park,Jong Tae Lim,Seong Chu Lim,Byung-Wook Ahn,Dang Xuan Dang,Jungwon Kim,Seungsu Kang,Ki Kang Kim,Jaeuk Bahng,Wonkil Sakong

doi:10.3390/ma14164477

Abstract

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 3ω method, we measured the thermal conductivity of TaS3 as a function of temperature. Electrons dominate the heat conduction of a metal. The Wiedemann–Franz law states that the thermal conductivity of a metal is proportional to the electrical conductivity σ with a proportional coefficient of L0, known as the Lorenz number—that is, . Our characterization of the thermal conductivity of metallic TaS3 reveals that, at a given temperature T, the thermal conductivity κ 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 . This result implies the possibility of an existing heat conduction path that the Sommerfeld theory cannot account for.

Highlights

We address the behavior of the thermal conductivity of TaS3 1D nanowires above room temperature
Our thermal conductivity measurement using the 3ω method addresses the fact that the heat transport of TaS3 at room temperature does not obey the
We studied the thermal properties of TaS3 using the 3ω method [18]

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The Wiedemann–Franz (W–F) law assesses the correlation between heat and charge conduction by the electrons in the metal. The electron in this law is assumed to be noninteracting and expected to move in a single band, which is not true all the time, many metals follow the law well [13]. Our thermal conductivity measurement using the 3ω method addresses the fact that the heat transport of TaS3 at room temperature does not obey the. W–F law, which assessing the transport of heat and electrical current by electron diffusion across the temperature gradient. The Lorenz number grew as large as 12 times ( L ∼ 12L0 )

TaS3 Growth

Electrical and Thermal Characterizations of a Bundle of TaS3

Resistance–Temperature Dependence

Characterization of Temperature-Dependent Lorenz Number

Whole measurement single TaS