Verification of Wiedemann-Franz law in silver with moderate residual resistivity ratio

• DOI: 10.48550/arxiv.2308.12349
• Publication Date: 2023-01-01
• Authors: Marijn Lucas; L. V. Levitin; Petra Knappová; J. Nyéki; A. Casey; J. Saunders
• Keywords: Residual resistivity; Wiedemann–Franz law; Atmospheric temperature range

Electrical and thermal transport were studied in a vacuum-annealed polycrystalline silver wire with residual resistivity ratio 200-400, the temperature range 0.1-1.2K magnetic fields up to 5T. Both at zero field 5T exhibits Wiedemann-Franz law fundamental Lorenz number, contrary an earlier report [Gloos, K. et al, Cryogenics 30, 14 (1990)]. Our result demonstrates that is excellent material for links ultra-low-temperature experiments operating high fields.