Thermopower and thermal conductivity in the Weyl semimetal NbP

Abstract

The Weyl semimetal NbP exhibits an extremely large magnetoresistance (MR) and an ultra-high mobility. The large MR originates from a combination of the nearly perfect compensation between electron- and hole-type charge carriers and the high mobility, which is relevant to the topological band structure. In this work we report on temperature- and field-dependent thermopower and thermal conductivity experiments on NbP. Additionally, we carried out complementary heat capacity, magnetization, and electrical resistivity measurements. We found a giant adiabatic magnetothermopower with a maximum of 800 $\mu$V/K at 50 K in a field of 9 T. Such large effects have been observed rarely in bulk materials. We suggest that the origin of this effect might be related to the high charge-carrier mobility. We further observe pronounced quantum oscillations in both thermal conductivity and thermopower. The obtained frequencies compare well with our heat capacity and magnetization data.

6 pages, 3 figures

References in corpus (5)

• The electronic properties of graphene
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Dirac materials
• Thermoelectric properties of Weyl and Dirac semimetals
• Large Seebeck Effect by Charge-Mobility Engineering

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• Magneto-Seebeck effect in bismuth
• Formation of an electron-phonon bi-fluid in bulk antimony
• Strong anisotropy of electron-phonon interaction in NbP probed by magnetoacoustic quantum oscillations
• Chiral anomalies in 3D spin-orbit coupled metals: electrical, thermal, and gravitational anomaly
• Severe violation of the Wiedemann-Franz law in quantum oscillations of NbP
• Thermoelectric properties of inversion symmetry broken Weyl semimetal-Weyl superconductor hybrid junctions
• Giant quantum oscillations in thermal transport in low-density metals via electron absorption of phonons
• Nernst power factor and figure of merit in compensated semimetal ScSb
• Design Principles for Topological Thermoelectrics