Largely Suppressed Magneto-Thermal Conductivity and Enhanced Magneto-Thermoelectric Properties in PtSn_(4)  

作　　者：Chenguang Fu Satya NGuin Thomas Scaffidi Yan Sun Rana Saha Sarah JWatzman Abhay KSrivastava Guowei Li Walter Schnelle Stuart SPParkin Claudia Felser Johannes Gooth 

机构地区：[1]Max Planck Institute for Chemical Physics of Solids,01187 Dresden,Germany [2]Department of Physics,University of California,Berkeley,CA 94720,USA [3]Department of Physics,University of Toronto,Toronto,Ontario M5S 1A7,Canada [4]Max Planck Institute of Microstructure Physics,06120 Halle,Germany [5]Department of Mechanical and Materials Engineering,University of Cincinnati,Cincinnati,OH 45219,USA [6]Institute of Physics,Martin Luther University Halle-Wittenberg,06120 Halle,Germany

出　　处：《Research》2020年第1期769-776,共8页研究（英文）

基　　金：This work was financially supported by the ERC advanced grant No.(742068)“TOP-MAT”.Ch.F and S.N.G.acknowledge financial support from the Alexander von Humboldt Foundation;T.S.acknowledges support from the Emergent Phenomena in Quantum Systems initiative of the Gordon and Betty Moore Foundation;A.K.S.was funded by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)—project number 314790414;M.E.K.supported by The Netherlands Organization for Science NWO(graduate program 2013,No.022.005.006).

摘　　要：Highly conductive topological semimetals with exotic electronic structures offer fertile ground for the investigation of the electrical and thermal transport behavior of quasiparticles.Here,we find that the layer-structured Dirac semimetal PtSn4 exhibits a largely suppressed thermal conductivity under a magnetic field.At low temperatures,a dramatic decrease in the thermal conductivity of PtSn4 by more than two orders of magnitude is obtained at 9 T.Moreover,PtSn_(4)shows both strong longitudinal and transverse thermoelectric responses under a magnetic field.Large power factor and Nernst power factor of approximately 80-100μW·cm^(-1)·K^(-2)are obtained around 15K in various magnetic fields.As a result,the thermoelectric figure of merit zT is strongly enhanced by more than 30 times,compared to that without a magnetic field.This work provides a paradigm for the decoupling of the electron and hole transport behavior of highly conductive topological semimetals and is helpful for developing topological semimetals for thermoelectric energy conversion.

关 键 词：FIELD PARTICLES TOPOLOGICAL 

分 类 号：O46[理学—电子物理学]