Magneto-Seebeck effect and ambipolar Nernst effect in CsV${}_3$Sb${}_5$ superconductor

Abstract

We present a study of Seebeck and Nernst effect in combination with magnetoresistance and Hall measurements of the Kagome superconductor CsV${}_3$Sb${}_5$. Sizable magneto-Seebeck signal appears once the charge density wave (CDW) order sets in below $T_{CDW}$=94 K. The Nernst signal peaks at a lower temperature $T^{\ast }$=35 K, crossing which the Hall coefficient switches sign, which we attribute to the ambipolar transport of compensated bands due to the multi-band nature of CsV${}_3$Sb${}_5$. Sublinear Nernst signal as a function of magnetic field, together with large anomalous Nernst effect (ANE) also emerge inside the CDW phase, despite the absence of long-range magnetic order. These findings suggest that, the transport properties are dominated by small pockets with multi-band profile, and that the unusual band topology also plays an import role in the CDW state of CsV${}_3$Sb${}_5$.

8 pages, 3 figures

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• Anomalous thermoelectric effects and quantum oscillations in the kagome metal CsV${}_3$Sb${}_5$
• Anomalous thermal Hall effect and anomalous Nernst effect of CsV${}_3$Sb${}_5$
• Emergence of large quantum oscillation frequencies in thin flakes of the kagome superconductor CsV${}_3$Sb${}_5$
• Electronic properties of correlated kagomé metals AV${}_3$Sb${}_5$(A = K, Rb, Cs): A perspective
• Magnetic Breakdown and Topology in the Kagome Superconductor CsV3Sb5 under High Magnetic Field
• Charge fluctuations above $T_{\mathrm{CDW}}$ revealed by glasslike thermal transport in kagome metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• Anomalous Hall effect and two-dimensional Fermi surfaces in the charge-density-wave state of kagome metal RbV${}_3$Sb${}_5$
• Anomalous Nernst effect in a ferrimagnetic nodal-line semiconductor Mn${}_3$Si${}_2$Te${}_6$
• Electrical and thermal transport properties of kagome metals $A$Ti${}_3$Bi${}_5$ ($A$ = Rb, Cs)
• Multiband effects in thermoelectric and electrical transport properties of kagome superconductors $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• Emergent topological quantum orbits in the charge density wave phase of kagome metal CsV${}_3$Sb${}_5$
• Large Fermi surface in pristine kagome metal CsV${}_3$Sb${}_5$ and enhanced quasiparticle effective masses
• Similarities and Differences in the Fermiology of Kagome Metals AV${}_3$Sb${}_5$ (A=K, Rb, Cs) Revealed by Shubnikov-de Haas Oscillations
• Electrical and thermal transport properties of kagome metals AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
• Anomalous Magnetotransport in the Paramagnetic State of a Magnetic Kagome Metal EuTi${}_3$Bi${}_4$
• Chiral pair density wave as a precursor of the pseudogap in kagomé superconductors
• Large Oscillatory Thermal Hall Effect in Kagome Metals
• Large Nernst Effect in a layered metallic antiferromagnet EuAl${}_2$Si${}_2$
• Topological Superconducting States and Quasiparticle Transport on Kagome Lattice
• Impact of tiny Fermi pockets with extremely high mobility on the Hall anomaly in the kagome metal CsV${}_3$Sb${}_5$
• Anomalous Nernst Effect and Its Implications for Time-Reversal Symmetry Breaking in Kagome Metal ScV6Sn6