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Weyl semimetals combine topological and semimetallic effects, making themcandidates for interesting and effective thermoelectric transport properties.Here, we present experimental results on polycrystalline NbP, demonstrating thesimultaneous existence of a large Nernst effect and a large magneto-Seebeckeffect, which is typically not observed in a single material at the sametemperature. We compare transport results from two polycrystalline samples ofNbP with previously published work, observing a shift in the temperature atwhich the maximum Nernst and magneto-Seebeck thermopowers occur, while stillmaintaining thermopowers of similar magnitude. Theoretical modeling shows howdoping strongly alters both the Seebeck and Nernst magneto-thermopowers byshifting the temperature-dependent chemical potential, and the correspondingcalculations provide a consistent interpretation of our results. Thus, we offerdoping as a tuning mechanism for shifting magneto-thermoelectric effects totemperatures appropriate for device applications, improving zT at desirableoperating temperature. Furthermore, the simultaneous presence of both a largeNernst and magneto-Seebeck thermopower is uncommon and offers unique deviceadvantages if the thermopowers are used additively. Here, we also propose aunique thermoelectric device which would collectively harness the large Nernstand magneto-Seebeck thermopowers to greatly enhance the output and zT ofconventional thermoelectric devices.

Doping as a tuning mechanism for magneto-thermoelectric effects to improve zT in polycrystalline NbP