Unusual violation of the Wiedemann–Franz law at ultralow temperatures in topological compensated semimetals

Yi-Yan Wang (), Xin Rao, Ying Zhou, Xiang- De Zhu, Xia Zhao, Gang Chen (), Na Li (), Hui Liang (), Tian-Long Xia and Xue-Feng Sun ()
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Yi-Yan Wang: Anhui University
Xin Rao: University of Science and Technology of China
Ying Zhou: Anhui University
Xiang- De Zhu: Chinese Academy of Sciences
Xia Zhao: University of Science and Technology of China
Gang Chen: Peking University
Na Li: Anhui University
Hui Liang: Anhui University
Tian-Long Xia: Renmin University of China
Xue-Feng Sun: Anhui University

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Thermal conductivity and electrical resistivity at ultralow temperatures and high magnetic fields are studied in the topological compensated semimetals TaAs2, NbAs2, and NdSb. A striking phenomenon is observed where the thermal conductivity shows a T4 scaling at very low temperatures, while the resistivity shows a T-independent residual term. This indicates a strong violation of the Wiedemann–Franz (WF) law, since the field dependence of κ shows that the low-temperature thermal conductivity is dominated by electronic transport. The obtained Lorenz ratio is hundreds of times lower than Sommerfeld’s value even when approaching the zero-temperature limit. The strong downward deviation of the WF law at very low temperatures point to a non-Fermi liquid state in these materials. In addition, the giant thermal quantum oscillations accompanied by antiphase characteristics have been observed. Our findings not only point to a possible non-Fermi liquid ground state of these topological compensated semimetals, but also reveal an unusual T4 temperature dependence for the electronic thermal conductivity.

Date: 2025
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DOI: 10.1038/s41467-024-55141-w

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