Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te
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 perpendic...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2023-01-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0131326 |
| _version_ | 1811172615823294464 |
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| author | Keisuke Hirata Kentaro Kuga Masaharu Matsunami Minyue Zhu Joseph P. Heremans Tsunehiro Takeuchi |
| author_facet | Keisuke Hirata Kentaro Kuga Masaharu Matsunami Minyue Zhu Joseph P. Heremans Tsunehiro Takeuchi |
| author_sort | Keisuke Hirata |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-10T17:33:10Z |
| format | Article |
| id | doaj.art-1c0cf2ccc7e046b98a12e43a34ba7de4 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-04-10T17:33:10Z |
| publishDate | 2023-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-1c0cf2ccc7e046b98a12e43a34ba7de42023-02-03T16:42:06ZengAIP Publishing LLCAIP Advances2158-32262023-01-01131015016015016-910.1063/5.0131326Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2TeKeisuke Hirata0Kentaro Kuga1Masaharu Matsunami2Minyue Zhu3Joseph P. Heremans4Tsunehiro Takeuchi5Toyota Technological Institute, Nagoya, Aichi 468-8511, JapanToyota Technological Institute, Nagoya, Aichi 468-8511, JapanToyota Technological Institute, Nagoya, Aichi 468-8511, JapanDepartment of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210, USADepartment of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210, USAToyota Technological Institute, Nagoya, Aichi 468-8511, JapanIn 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.http://dx.doi.org/10.1063/5.0131326 |
| spellingShingle | Keisuke Hirata Kentaro Kuga Masaharu Matsunami Minyue Zhu Joseph P. Heremans Tsunehiro Takeuchi Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te AIP Advances |
| title | Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te |
| title_full | Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te |
| title_fullStr | Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te |
| title_full_unstemmed | Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te |
| title_short | Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te |
| title_sort | magneto thermal conductivity effect and enhanced thermoelectric figure of merit in ag2te |
| url | http://dx.doi.org/10.1063/5.0131326 |
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