Abnormally enhanced Hall Lorenz number in the magnetic Weyl semimetal NdAlSi.

ABSTRACT: In Landau's celebrated Fermi liquid theory, electrons in a metal obey the Wiedemann-Franz law at the lowest temperatures. This law states that electron heat and charge transport are linked by a constant L₀, i.e., the Sommerfeld value of the Lorenz number (L). Such relation can be violated at elevated temperatures where the abundant inelastic scattering leads to a reduction of the Lorenz number (L < L₀). Here, we report a rare case of remarkably enhanced Lorenz number (L > L₀) discovered in the magnetic topological semimetal NdAlSi. Measurements of the transverse electrical and thermal transport coefficients reveal that the Hall Lorenz number L_xy in NdAlSi starts to deviate from the canonical value far above its magnetic ordering temperature. More

SUBMITTER: Zhang N 

PROVIDER: S-EPMC11599383 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature