Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Topological Semimetals I
TT 7.3: Vortrag
Montag, 12. März 2018, 10:00–10:15, A 053
Large Nernst power factor in polycrystalline Weyl semimetal NbP — •Satya N. Guin, Chenguang Fu, Sarah J. Watzman, Gudrun Auffermann, Nitesh Kumar, Vicky Suess, Walter Schnelle, Yan Sun, Chandra Shekhar, and Claudia Felser — Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
The energy crisis has sparked a large boost in thermoelectric research, the base of which is the longitudinal thermoelectric response, the Seebeck effect. Recently, there is a growing interest in the Nernst effect (NE), the transverse thermoelectric response produced by the orthogonal thermal gradient and magnetic field. The NE is an alternate and simpler approach to conventional thermoelectrics as there is no need for both n-type or p-type legs. In parallel, Dirac and Weyl semimetals created an enormous interest due to interesting transport properties, which are gaining attention recently for NE. To date, the investigations are primarily engrossed on single crystals. However, the synthesis of large single crystals is the expensive, lengthy, and difficult process, which is unsuitable for mass production and practical applications. In contrast, polycrystalline samples are the better choice because of its ease of production. We demonstrate that polycrystalline, SPS sintered Weyl semimetal NbP show a large Nernst thermopower value of 90 µVK−1 and power factor of 35×10−4 Wm−1K−2 at 9 T. Our finding indicates the potential of polycrystalline Weyl semimetals for thermoelectrics.