Large Improvement of Thermoelectric Performance by Magnetism in Co-Based Full-Heusler Alloys.

ABSTRACT: Full-Heusler alloys (fHAs) exhibit high mechanical strength with earth-abundant elements, but their metallic properties tend to display small electron diffusion thermopower, limiting potential applications as excellent thermoelectric (TE) materials. Here, it is demonstrated that the Co-based fHAs Co₂ XAl (X = Ti, V, Nb) exhibit relatively high thermoelectric performance due to spin and charge coupling. Thermopower contributions from different magnetic mechanisms, including spin fluctuation and magnon drag are extracted. A significant contribution to thermopower from magnetism compared to that from electron diffusion is demonstrated. In Co₂ TiAl, the contribution to thermopower from spin fluctuation is higher than that from electron diffusion, resulting in an increment

SUBMITTER: Gui Z 

PROVIDER: S-EPMC10558654 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature