Ambipolar Nernst effect in NbSe${}_2$

Abstract

The first study of Nernst effect in NbSe${}_2$ reveals a large quasi-particle contribution with a magnitude comparable and a sign opposite to the vortex signal. Comparing the effect of the Charge Density Wave(CDW) transition on Hall and Nernst coefficients, we argue that this large Nernst signal originates from the thermally-induced counterflow of electrons and holes and indicates a drastic change in the electron scattering rate in the CDW state. The results provide new input for the debate on the origin of the anomalous Nernst signal in high-T${}_c$ cuprates.

5 pages including 4 figures

References in corpus (4)

• The onset of the vortex-like Nernst signal above Tc in La_{2-x}Sr_xCuO_4 and Bi_2Sr_{2-y}La_yCuO_6
• The high-field phase diagram of the cuprates derived from the Nernst effect
• Entropy of vortex cores on the border of the superconductor-to-insulator transition in an underdoped cuprate
• Anomalous dissipation in the mixed state of underdoped cuprates close to the superconductor-insulator boundary

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