Dresden 2020 – scientific programme

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AKE: Arbeitskreis Energie

AKE 4: Renewable Energy - Photovoltaics and Electronic Processes

AKE 4.3: Talk

Monday, March 16, 2020, 15:45–16:00, DÜL

Topological semimetal YbMnSb2 toward promising thermoelectric performance — •Yu Pan¹, Chenguang Fu¹, Jeffrey Snyder², and Claudia Felser¹ — ¹Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187, Dresden, Germany — ²Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA

Topological semimetals have attracted a lot of interest due to their exotic properties induced by the topological band structure. However, little is known about the thermoelectric properties of these materials. With extremely high mobility and heavy elements induced low thermal conductivity, topological semimetals can be high-performing thermoelectric materials. In this work, we report the thermoelectric properties of topological semimetal YbMnSb2 single crystal. A large Seebeck coefficient of ~160 μV/K at 300 K is obtained and there is no evidence for large bipolar thermal conductivity. Moreover, topologically protected both in-plane resistivity (~1 mΩ*cm) and cross-plane thermal conductivity (~1.5 W/mK) at 300 K are very close to that of the state-of-the-art (Bi,Sb)2Te3 polycrystalline samples, implying YbMnSb2 as promising thermoelectrics. Further enhancement of the thermoelectric performance relies on decreasing the in-plane thermal conductivity and/or the cross-plane resistivity. Taking YbMnSb2 as an example, we clarify the potential of topological semimetals toward high thermoelectric performance.