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10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)

[8a-E203-2]Electronic-structure reconstruction and bad-metal-like thermoelectric transport across the β–α phase transition in Ag₂Te

〇(D)Seiya One¹, Tack Saquai², Hiroki Ienaga³, Akira Nagaoka^4,5, Kenta Hongo^2,6, Mikio Koyano¹ (1.JAIST Mater. Sci., 2.JAIST Inf. Sci., 3.Univ. Miyazaki GSE, 4.Univ. Miyazaki Eng., 5.Univ. Miyazaki GXRC, 6.JAIST CASC)

Keywords:

silver chalcogenide,phase transition,electronic transport properties

Ag₂Teのβ–α相転移に伴う熱電輸送変化を，輸送測定と第一原理計算から検討した．約418 Kの相転移直上で電気抵抗率は急増する一方，Seebeck係数は大きな負の値を維持し，570 K付近でZT ≈ 0.7に達した．超イオン伝導を示す高温α相では重い電子バンドが現れ，有効質量と散乱の増加により，平均自由行程がフェルミ波長程度まで短くなるMIR限界近傍のbad-metal-like輸送へ近づくことを示す．

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[8a-E203-2]Electronic-structure reconstruction and bad-metal-like thermoelectric transport across the β–α phase transition in Ag2Te

Keywords:

[8a-E203-2]Electronic-structure reconstruction and bad-metal-like thermoelectric transport across the β–α phase transition in Ag₂Te