| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications IX
|
| Presentation Title |
Effect of Phonon Drag on Seebeck Coefficient Based on Linear Response Theory |
| Author(s) |
Masao Ogata, Junya Endo, Hiroyasu Matsuura, Hideaki Maebashi, Hidetoshi Fukuyama |
| On-Site Speaker (Planned) |
Masao Ogata |
| Abstract Scope |
We studied the general framework of the linear response theory to thermal perturbation and clarified the range of validity of Sommerfeld-Bethe relation that leads to the Mott formula at low temperatures. The contributions which do not satisfy the Sommerfeld-Bethe relation are identified, including the well-known phonon drag. Based on this theoretical work, we study the phonon drag effect on Seebeck coefficient in FeSb2 in the presence of strong impurity potentials. It is found that the Seebeck coefficient due to the phonon drag mechanism is enhanced significantly in proportional to the square of the effective mass. This significant enhancement in the Seebeck coefficient is shown to occur in the temperature range where the electrical resistivity has a shoulder structure in FeSb2. A similar effect using magnons, i.e., magnon drag effect is also studied, having the large Seebeck coefficient discovered recently in Fe-Heusler thin film in mind. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Electronic Materials, Modeling and Simulation, |