Anomalous Thomson Effect
Ying-Fei Zhang, Zhi-Fan Zhang, Zhen-Gang Zhu, Gang Su
TLDR
This paper proposes the Anomalous Thomson Effect (ATE), showing it's enhanced over the Anomalous Nernst Effect (ANE) and promising for thermoelectric refrigeration.
Key contributions
- Introduces the Anomalous Thomson Effect (ATE), analogous to anomalous Hall and Nernst effects.
- Derives the Anomalous Thomson Coefficient (ATC) from the Anomalous Nernst Coefficient (ANC).
- Demonstrates ATC is generally enhanced over ANC, with a ratio approaching three at low temperatures.
- Suggests ATE's potential for solid-state thermoelectric refrigeration, verifiable with existing ANE data.
Why it matters
This paper introduces a novel thermoelectric effect, the Anomalous Thomson Effect, which shows significant enhancement over the known Anomalous Nernst Effect. Its potential for efficient solid-state refrigeration, especially in materials like CeCrGe3, is substantial. Crucially, the effect can be verified using existing experimental data, accelerating research and development in this field.
Original Abstract
We propose an effect named the anomalous Thomson effect (ATE), analogous to the anomalous Hall effect and the anomalous Nernst effect (ANE). The anomalous Thomson coefficient (ATC) is derived as a function of the anomalous Nernst coefficient (ANC); hence, the ATC inherits the same mechanisms of the ANC. Specifically, we study a massive Dirac model for Fe3Sn2 to capture intrinsic Berry-curvature-driven transport. Our results show that the ATC is generally enhanced relative to the ANC. In the low-temperature limit, the ratio ATC/ANC approaches three. Since the relation between the ATE and the ANE is model-independent, we utilize experimental ANE data to infer experiment-related ATC for CoS2, Co3Sn2S2, and CeCrGe3. We find that the ATC for CeCrGe3 can be as large as fifteen times the ANC in the liquid-nitrogen temperature regime, making this effect highly attractive for solid-state thermoelectric refrigeration in this temperature range. It is important to emphasize that the proposed ATE can be directly verified using existing ANE data, without the need for additional equipment or measurements.
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