Low-temperature thermal conductivity of thermoelectric Co1−xMxSi (M = Fe, Ni) alloys
Ivanov Y, Levin AA, Novikov S, Pshenay-Severin D, Volkov M, Zyuzin A, Burkov A, Nakama T, Schnatmann L, Reith H, Nielsch K (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 20
Article Number: 100666
DOI: 10.1016/j.mtener.2021.100666
Abstract
We study the low-temperature electrical and thermal conductivity of CoSi and Co1−xMxSi alloys (M = Fe, Ni; x ≤ 0.06). Measurements show that the low-temperature electrical conductivity of Co1−xFexSi alloys decreases at x > 0.01 by an order of magnitude compared with that of pure CoSi. It was expected that both the lattice and electronic contributions to thermal conductivity would decrease in the alloys. However, our experimental results revealed that at temperatures below 20 K, the thermal conductivity of Fe- and Ni-containing alloys is several times larger than that of pure CoSi. We discuss possible mechanisms of the thermal conductivity enhancement. The most probable one is the dominant scattering of phonons by charge carriers. We propose a simple theoretical model that takes into account the complex semimetallic electronic structure of CoSi with nonequivalent charge carrier pockets. This model explains well the increase of the lattice thermal conductivity with increasing disorder and the linear temperature dependence of thermal conductivity in the Co1−xFexSi alloys below 20 K.
Involved external institutions
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Ioffe Physical-Technical Institute / Физико-технический институт имени А. Ф. Иоффе РАН
Russian Federation (RU)
University of the Ryukyus / 琉球大学
Japan (JP)
Germany (DE)
Ioffe Physical-Technical Institute / Физико-технический институт имени А. Ф. Иоффе РАН
Russian Federation (RU)
University of the Ryukyus / 琉球大学
Japan (JP)
How to cite
APA:
Ivanov, Y., Levin, A.A., Novikov, S., Pshenay-Severin, D., Volkov, M., Zyuzin, A.,... Nielsch, K. (2021). Low-temperature thermal conductivity of thermoelectric Co1−xMxSi (M = Fe, Ni) alloys. Materials Today Energy, 20. https://doi.org/10.1016/j.mtener.2021.100666
MLA:
Ivanov, Y., et al. "Low-temperature thermal conductivity of thermoelectric Co1−xMxSi (M = Fe, Ni) alloys." Materials Today Energy 20 (2021).
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