We present a study of Seebeck and Nernst effect in combination with magnetoresistance and Hall measurements of the Kagome superconductor CsV3Sb5. Sizable magneto-Seebeck signal appears once the charge density wave (CDW) order sets in below TCDW=94 K. The Nernst signal peaks at a lower temperature T∗=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 CsV3Sb5. 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 CsV3Sb5.
@article{arxiv.2110.00289,
title = {Magneto-Seebeck effect and ambipolar Nernst effect in CsV$_3$Sb$_5$ superconductor},
author = {Yuhan Gan and Wei Xia and Long Zhang and Kunya Yang and Xinrun Mi and Aifeng Wang and Yisheng Chai and Yanfeng Guo and Xiaoyuan Zhou and Mingquan He},
journal= {arXiv preprint arXiv:2110.00289},
year = {2021}
}