Temperature dependence of the Spin Seebeck effect in a mixed valent manganite
| Autor: | Sunil Nair, Satishchandra Ogale, Arup Ghosh, Rajesh Mandal, Avirup De |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy Manganite 01 natural sciences symbols.namesake Magnetization Condensed Matter::Materials Science Condensed Matter - Strongly Correlated Electrons Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Thermoelectric effect symbols Exponent Condensed Matter::Strongly Correlated Electrons 010306 general physics Anisotropy Mixing (physics) Nernst effect Spin-½ |
| Popis: | We report on temperature dependent measurements of the longitudinal spin Seebeck effect (LSSE) in the mixed valent manganite ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$. By disentangling the contribution arising due to the anisotropic Nernst effect, we observe that in the low temperature regime, the LSSE exhibits a ${T}^{0.5}$ dependence, which matches well with that predicted by the magnon-driven spin current model. Across the double exchange driven paramagnetic-ferromagnetic transition, the LSSE exponent is significantly higher than the magnetization one, and also depends on the thickness of the spin-to-charge conversion layer. These observations highlight the importance of individually ascertaining the temperature evolution of different mechanisms---especially the spin mixing conductance---which contribute to the measured spin Seebeck signal. |
| Databáze: | OpenAIRE |
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