Resonant Nernst effect in the metallic and field-induced spin density wave states of (TMTSF)2ClO4

TL;DR

This paper investigates the giant resonant Nernst effect observed in (TMTSF)2ClO4, revealing its presence in both metallic and spin density wave states, and constraining theoretical models of these phases.

Contribution

It demonstrates that the resonant Nernst effect is a general feature of (TMTSF)2ClO4, occurring in multiple phases and challenging existing models of its electronic states.

Findings

Resonant Nernst signal observed in metallic and spin density wave phases.

Effect appears near magic angles in tilted magnetic fields.

Results restrict models of unconventional density waves and Cooper pairing.

Abstract

We examine an unusual phenomenon where, in tilted magnetic fields near magic angles parallel to crystallographic planes, a "giant" resonant Nernst signal has been observed by Wu et al.[Phys. Rev. Lett. 91 56601(2003)] in the metallic state of an organic conducting Bechgaard salt. We show that this effect appears to be a general feature of these materials, and is also present in the field induced spin density wave phase with even larger amplitude. Our results place new restrictions on models that treat the metallic state as an unconventional density wave or as a state with finite Cooper pairing.