Giant Nernst effect in the incommensurate charge density wave state of P4W12O44

TL;DR

This paper investigates the Nernst effect in P4W12O44, revealing that electronic carrier condensation and high-mobility carriers from residual Fermi surface pockets produce a large Nernst response, akin to heavy fermion materials.

Contribution

It provides the first detailed analysis of the Nernst effect in an incommensurate CDW state of tungsten bronze, highlighting the roles of carrier condensation and residual high-mobility electrons.

Findings

Large Nernst effect comparable to heavy fermion compounds.

Electronic carriers condense in the CDW state.

High-mobility electrons and holes from residual Fermi pockets.

Abstract

We report the study of Nernst effect in quasi-low dimensional tungsten bronze P4W12O44 showing a sequence of Peierls instabilities. We demonstrate that both condensation of the electronic carriers in the CDW state and the existence of high-mobility electrons and holes originating from the small pockets remaining in the incompletely nested Fermi surface give rise to a Nernst effect of a magnitude similar to that observed in heavy fermion compounds.