|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications IX
||Study of Thermopower Enhancement by Spin Fluctuation In Ferromagnetic Fe<sub>2</sub>V<sub>1-x</sub>Co<sub>x</sub>Al Full Heusler Alloys
||Philipp Sauerschnig, Naohito Tsujii, Takao Mori
|On-Site Speaker (Planned)
The development of thermoelectric materials requires the exploration of new phenomena and effects. Among these is the crossover of thermoelectricity and magnetism. It was recently found that a significant enhancement in the power factor can be achieved in weakly-ferromagnetic metals via spin fluctuations’ drag of conduction electrons. Fe<sub>2</sub>Al based materials are attractive candidates for RT thermoelectric applications due to their high power factors leading to high module power output. Since stoichiometric Fe<sub>2</sub>VAl is non-magnetic we studied the effects of Fe<sub>2</sub>V<sub>1-x</sub>Co<sub>x</sub>Al substitution on the magnetic and thermoelectric properties. Ferromagnetic ordering with Curie temperatures T<sub>C</sub> increasing with increasing cobalt substitution were observed. The effect of the spin fluctuations is strongest around the temperature of the ferromagnetic transition, so it is desirable for the material to have a T<sub>C</sub> close to RT. Low temperature measurements of the transport properties were performed with applied magnetic fields to probe the effect of the spin fluctuations.