Abnormally enhanced Hall Lorenz number in the magnetic Weyl semimetal NdAlSi

Nan Zhang, Daifeng Tu, Ding Li, Kaixin Tang, Linpeng Nie, Houpu Li, Hongyu Li, Tao Qi, Tao Wu, Jianhui Zhou (), Ziji Xiang () and Xianhui Chen ()
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Nan Zhang: University of Science and Technology of China
Daifeng Tu: University of Science and Technology of China
Ding Li: University of Science and Technology of China
Kaixin Tang: University of Science and Technology of China
Linpeng Nie: University of Science and Technology of China
Houpu Li: University of Science and Technology of China
Hongyu Li: University of Science and Technology of China
Tao Qi: University of Science and Technology of China
Tao Wu: University of Science and Technology of China
Jianhui Zhou: Chinese Academy of Sciences
Ziji Xiang: University of Science and Technology of China
Xianhui Chen: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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) discovered in the magnetic topological semimetal NdAlSi. Measurements of the transverse electrical and thermal transport coefficients reveal that the Hall Lorenz number Lxy in NdAlSi starts to deviate from the canonical value far above its magnetic ordering temperature. Moreover, Lxy displays strong nonmonotonic temperature and field dependence, reaching its maximum value close to 2L0 in an intermediate parameter range. Further analysis excludes charge-neutral excitations as the origin of enhanced Lxy. Alternatively, we attribute it to the Kondo-type elastic scattering off localized 4f electrons, which creates a peculiar energy distribution of the quasiparticle relaxation time. Our results provide insights into the perplexing transport phenomena caused by the interplay between charge and spin degrees of freedom.

Date: 2024
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DOI: 10.1038/s41467-024-54632-0

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