Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te
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- Keisuke Hirata
- Toyota Technological Institute 1 , Nagoya, Aichi 468-8511, Japan
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- Kentaro Kuga
- Toyota Technological Institute 1 , Nagoya, Aichi 468-8511, Japan
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- Masaharu Matsunami
- Toyota Technological Institute 1 , Nagoya, Aichi 468-8511, Japan
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- Minyue Zhu
- Department of Mechanical and Aerospace Engineering, The Ohio State University 2 , Columbus, Ohio 43210, USA
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- Joseph P. Heremans
- Department of Mechanical and Aerospace Engineering, The Ohio State University 2 , Columbus, Ohio 43210, USA
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- Tsunehiro Takeuchi
- Toyota Technological Institute 1 , Nagoya, Aichi 468-8511, Japan
抄録
<jats:p>In this study, we report a large magneto-thermal conductivity effect, potentially usable in heat flow switches and thermoelectric devices, in Ag2Te over a wide temperature range, including room temperature. When a magnetic field of μ0H = 9 T is applied to Ag2Te at 300 K along the direction perpendicular to the heat and electric currents, the thermal conductivity κ decreases by a remarkable 61%. This effect is mainly caused by the suppressed electronic thermal conductivity in association with a significant magnetoresistance effect, but the suppression of the thermal conductivity is larger than that of the electrical conductivity, presumably due to a field-induced decrease in the Lorenz ratio. Its very low lattice thermal conductivity, as low as 0.5 W m−1 K−1, also greatly contributes to the large relative magneto-thermal conductivity effect. The significant decrease in thermal conductivity and the 18% increase in the Seebeck coefficient S lead to a nearly 100% increase in the thermoelectric figure of merit zT = S2σTκ−1 despite the 43% decrease in electrical conductivity σ.</jats:p>
収録刊行物
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- AIP Advances
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AIP Advances 13 (1), 2023-01-01
AIP Publishing