Enhanced Electron Heat Conduction in TaS₃ 1D Metal Wire

Area of Science:

• Condensed Matter Physics
• Materials Science

Background:

• 1D wire tantalum trisulfide (TaS₃) shows metallic properties at room temperature, transitioning to a semiconductor below its Peierls transition temperature (~210 K).
• Heat conduction in metals is typically dominated by electrons, as described by the Wiedemann-Franz law (κ = σL₀T).

Purpose of the Study:

• To investigate the thermal conductivity (κ) of metallic TaS₃ as a function of temperature.
• To compare the experimentally measured thermal conductivity with predictions from the Wiedemann-Franz law.

Main Methods:

• Utilized the 3ω method for precise thermal conductivity measurements.
• Characterized the temperature-dependent thermal conductivity of TaS₃.

Main Results:

• The measured thermal conductivity of metallic TaS₃ was significantly higher than predicted by the Wiedemann-Franz law.
• Specifically, the thermal conductivity was found to be approximately 12 times greater than the W-F law prediction (L ≈ 12L₀).

Conclusions:

• The findings indicate a substantial deviation from the Wiedemann-Franz law in metallic TaS₃.
• This suggests the presence of an additional, unaccounted-for heat conduction mechanism beyond standard electron transport described by Sommerfeld theory.