Signature of Electron-magnon Umklapp Scattering in L10 FePt probed by Thermoelectric Measurements
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2013
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| _version_ | 1866914838015377408 |
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| author | Yan, Xiaoxian Huai, Chang Xing, Hui Parry, James P. Yang, Yusen Tang, Guoxiong Yao, Chao Hu, Guohan Sabirianov, Renat Zeng, Hao |
| author_facet | Yan, Xiaoxian Huai, Chang Xing, Hui Parry, James P. Yang, Yusen Tang, Guoxiong Yao, Chao Hu, Guohan Sabirianov, Renat Zeng, Hao |
| contents | We report unconventional thermoelectric power (Seebeck coefficient, S) in L10 structured FePt films. The temperature dependence of S can be well fitted by a phenomenological expression consisting of electron diffusion and magnon-drag contributions. Interestingly, the magnon drag coefficient carries an opposite sign to that of electron diffusion, revealing a dominant contribution from the elusive electron-magnon Umklapp scattering. DFT calculations identify several bands crossing the Brillouin zone boundaries, facilitating the Umklapp process. The large spin-orbit coupling in FePt results in strong mixing of majority and minority spins among some of those bands, greatly enhancing the electron-magnon scattering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1312_1634 |
| institution | arXiv |
| publishDate | 2013 |
| record_format | arxiv |
| spellingShingle | Signature of Electron-magnon Umklapp Scattering in L10 FePt probed by Thermoelectric Measurements Yan, Xiaoxian Huai, Chang Xing, Hui Parry, James P. Yang, Yusen Tang, Guoxiong Yao, Chao Hu, Guohan Sabirianov, Renat Zeng, Hao Materials Science We report unconventional thermoelectric power (Seebeck coefficient, S) in L10 structured FePt films. The temperature dependence of S can be well fitted by a phenomenological expression consisting of electron diffusion and magnon-drag contributions. Interestingly, the magnon drag coefficient carries an opposite sign to that of electron diffusion, revealing a dominant contribution from the elusive electron-magnon Umklapp scattering. DFT calculations identify several bands crossing the Brillouin zone boundaries, facilitating the Umklapp process. The large spin-orbit coupling in FePt results in strong mixing of majority and minority spins among some of those bands, greatly enhancing the electron-magnon scattering. |
| title | Signature of Electron-magnon Umklapp Scattering in L10 FePt probed by Thermoelectric Measurements |
| topic | Materials Science |
| url | https://arxiv.org/abs/1312.1634 |