Abstract
One of the most important topics of cobalt oxides is the large thermopower (absolute Seebeck coefficient), which has been attracted attention due to their potential application as thermoelectric conversion material. In this chapter, the basics of thermoelectrics and thermoelectric response in cobalt oxides and related transition metal oxides are introduced. Thermopower is corresponding to the carried entropy by the electric current. In the strongly correlated electron systems, the spin and orbital degrees of freedom contribute to the entropy flow. The role of spin and orbital degrees of freedom on the thermoelectric effect is theoretically discussed.
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Notes
- 1.
In the non-interacting spinful electron system, the spin degeneracy is canceled out for the ratio between the numbers of the vacant and occupied states. Therefore, the role of spin degeneracy is often neglected in the semiconductor physics.
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Acknowledgements
We would like to thank K. Tsutsui, S. Maekawa, S. Okamoto, M. Mori, and M. Matsuo for helpful discussions. This paper is dedicated to the memory of Professor Sumio Ishihara, who recently passed away, for his kind hospitality and valuable discussions.
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Koshibae, W. (2021). Thermoelectric Properties of Cobalt Oxides and Other Doped Mott Insulators. In: Okimoto, Y., Saitoh, T., Kobayashi, Y., Ishihara, S. (eds) Spin-Crossover Cobaltite. Springer Series in Materials Science, vol 305. Springer, Singapore. https://doi.org/10.1007/978-981-15-7929-5_7
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