[17a-PA1-1~39] 9 Applied Materials Science (Poster)

[17a-PA1-29] Flat-band-induced thermoelectric properties in the kagome metal Ni_3-xCo_xSn

〇Shogo Yoshida¹, Takuya Udagawa¹, Miu Takahashi¹, Ryuji Okazaki¹ (1.Fac. of Sci. and Tech., Tokyo Univ. of Sci.)

Keywords:

kagome lattice,Co substituted

The Seebeck coefficient, a key metric for thermoelectric performance, is highly sensitive to electron–hole asymmetry in electronic transport. In this study, we investigate the impact of kagome-lattice-derived flat bands on thermoelectric properties through their influence on electron–hole asymmetry. Polycrystalline samples of the kagome metal Ni_3-xCo_xSn were synthesized, and systematic transport measurements were performed. By comparing the experimental results with electronic structures and transport functions obtained from first-principles calculations, we demonstrate that the enhancement of the magnitude of the Seebeck coefficient with increasing Co substitution originates from the flat band.