Field-induced spin density wave in (TMTSF)$_2$NO$_3$

TL;DR

This study investigates the interlayer magnetoresistance of (TMTSF)$_2$NO$_3$ under high magnetic fields and pressure, revealing a field-induced spin density wave with distinct quantum oscillation spectra, indicating a new electronic state.

Contribution

It reports the discovery of a field-induced spin density wave in (TMTSF)$_2$NO$_3$ at high pressure and magnetic field, with detailed analysis of quantum oscillations.

Findings

Field-induced spin density wave observed above 8.5 kbar and 20 T

Distinct quantum oscillation spectrum in the high-pressure state

Transition from semi-metallic to spin density wave state

Abstract

Interlayer magnetoresistance of the Bechgaard salt (TMTSF)$_2$NO$_3$ is investigated up to 50 teslas under pressures of a few kilobars. This compound, the Fermi surface of which is quasi two-dimensional at low temperature, is a semi metal under pressure. Nevertheless, a field-induced spin density wave is evidenced at 8.5 kbar above $\sim$ 20 T. This state is characterized by a drastically different spectrum of the quantum oscillations compared to the low pressure spin density wave state.